[Keymap] Update bcat's keymaps/userspace to share logic, add OLED functionality, and set up one of my macropads for WFH (#14702)

* Add script to build all bcat keymaps at once

* Move userspace RGB to separate source file

* Move layer handling logic into userspace

* Move keycap aliases into userspace

* Add OLED userspace library and Lily58 OLED setup

* Add Luna keyboard pet, generic OLED pet framework

Luna artwork and original implementation by HellSingCoder, licensed
under GPL v2.0.

See also: https://github.com/qmk/qmk_firmware/blob/6dfe915e26d7147e6c2bed495d3b01cf5b21e6ec/keyboards/sofle/keymaps/helltm/keymap.c

* Use OLED on bcat's Crkbd

I had to turn off a few unused features to address firmware size limits.

* Remove vestigial NK_TOGG keybindings

* Add post-render hook to OLED pet API

This enables OLED pets to draw custom widgets (e.g., LED indicator
status) on top of their animation frames.

* Add Isda keyboard pet

For future use on my Unicorne keyboard. Unicorn artwork by sparrow666,
licensed under GPL v2.0.

See also: https://opengameart.org/content/unicorn-2

* Replace OLED timeout implementation with custom

The default implementation never lets the OLED turn off if a continuous
animation is in progress. The custom one does.

* Move keyboard state for OLED functions into struct

No change in firmware size, but makes keymaps read a little nicer and
enables more functionality in OLED pets.

* Enable continuously running OLED pet (for Luna)

* Sync OLED state; enable Bootmagic only when needed

The new extensible split transport for Split Common finally allows OLED
on/off status to be synced between halves of the keyboard. :)

Unfortunately, this required disabling Bootmagic Lite to keep my Crkbd
under the firmware size limit. (I now after 28 bytes free on avr-gcc
version 8.5.0.) So now I'll enable Bootmagic only on keyboards that
actually require it, i.e., ones lacking an accessible reset button.

* Update 9-Key macropad keymap for working from home

* Remove includes redundant with quantum.h

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Simplify BCAT_OLED_PET makefile logic

* Swap some keys on my 9-Key macropad around

* Inline spurious variable in OLED code

* Remove max brightness that's now set by default

The default max brightness is only 120 rather than 150, but that might
actually fix some weirdness I've seen with bright white LED settings.

* Enable specific RGBLIGHT modes instead of default

The general trend these days seems to be enabling only the modes you
want, so I'm manually expanding the ones currently enabled by
RGBLIGHT_ANIMATIONS.

I'd like to try out the TWINKLE mode too, but it seems not to work at
all on ARM right now, and all my usable RGBLIGHT keebs are ARM boards.

* Reenable RGB_MATRIX animations after #15018

My Crkbd still has a reasonable amount of free space with these:
27974/28672 (97%, 698 bytes free). The RGB_MATRIX_KEYPRESSES effects
would put it over the firmware size limit, but I really don't ever use
those anyway.

* Use new get_u8_str function for WPM display

Co-authored-by: Drashna Jaelre <drashna@live.com>

34 files changed, 959 insertions, 134 deletions

diff --git a/keyboards/9key/keymaps/bcat/keymap.c b/keyboards/9key/keymaps/bcat/keymap.c
index 5c08a42a56..944a48c0d3 100644
--- a/keyboards/9key/keymaps/bcat/keymap.c
+++ b/keyboards/9key/keymaps/bcat/keymap.c
@@ -16,22 +16,21 @@
 
 #include QMK_KEYBOARD_H
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_FUNCTION,
-};
+#include "bcat.h"
 
-#define LY_FUNC MO(LAYER_FUNCTION)
-#define KY_LOCK LCA(KC_L) /* Cinnamon lock screen */
+#define KY_LOCK LGUI(KC_L) /* Chrome OS: Lock screen */
+#define KY_MICM LSG(KC_1)  /* Meet Shortcuts: Mute mic */
+#define KY_MICU LSG(KC_2)  /* Meet Shortcuts: Unmute mic */
+#define KY_RHAND LSG(KC_3) /* Meet Shortcuts: Raise/lower hand */
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
     [LAYER_DEFAULT] = LAYOUT(
-        KC_MPLY,  KC_VOLU,  KC_MSTP,
-        KC_MPRV,  KC_VOLD,  KC_MNXT,
-        KY_LOCK,  KC_MUTE,  LY_FUNC
+        KC_MPLY,  KC_VOLU,  KY_RHAND,
+        KY_LOCK,  KC_VOLD,  KY_MICU,
+        LY_FN1,   KC_MUTE,  KY_MICM
     ),
-    [LAYER_FUNCTION] = LAYOUT(
+    [LAYER_FUNCTION_1] = LAYOUT(
         EEP_RST,  _______,  RESET,
         _______,  _______,  _______,
         _______,  _______,  _______
diff --git a/keyboards/9key/keymaps/bcat/readme.md b/keyboards/9key/keymaps/bcat/readme.md
index 2dee51de8b..d38ae5463b 100644
--- a/keyboards/9key/keymaps/bcat/readme.md
+++ b/keyboards/9key/keymaps/bcat/readme.md
@@ -1,5 +1,5 @@
 # bcat's 9-Key layout
 
-This is a super simple PCB-mount macropad with nine keys, used at work for
-media keys and quick access to screen lock on Linux (Cinnamon desktop
-environment).
+This is a super simple PCB-mount macropad with nine keys, used on my
+work-from-home Chromebox for media/volume control and to activate some global
+shortcuts for Google Meet.
diff --git a/keyboards/eco/keymaps/bcat/config.h b/keyboards/eco/keymaps/bcat/config.h
index dffdc7b40a..f2d51c324a 100644
--- a/keyboards/eco/keymaps/bcat/config.h
+++ b/keyboards/eco/keymaps/bcat/config.h
@@ -16,6 +16,8 @@
 
 #pragma once
 
+#define BCAT_ORTHO_LAYERS
+
 /* WS2812B RGB LED strip hand wired to Elite-C. */
 #define RGB_DI_PIN B7
 #define RGBLED_NUM 15
diff --git a/keyboards/eco/keymaps/bcat/keymap.c b/keyboards/eco/keymaps/bcat/keymap.c
index d46a7d416b..8c50a9ed55 100644
--- a/keyboards/eco/keymaps/bcat/keymap.c
+++ b/keyboards/eco/keymaps/bcat/keymap.c
@@ -18,21 +18,6 @@
 
 #include "bcat.h"
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_LOWER,
-    LAYER_RAISE,
-    LAYER_ADJUST,
-};
-
-#define LY_LWR MO(LAYER_LOWER)
-#define LY_RSE MO(LAYER_RAISE)
-
-#define KY_CSPC LCTL(KC_SPC)
-#define KY_ZMIN LCTL(KC_EQL)
-#define KY_ZMOUT LCTL(KC_MINS)
-#define KY_ZMRST LCTL(KC_0)
-
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
     /* Default layer: http://www.keyboard-layout-editor.com/#/gists/2c11371c7a5f7cd08a0132631d3d3281 */
@@ -58,12 +43,10 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     ),
     /* Adjust layer: http://www.keyboard-layout-editor.com/#/gists/b18aafa0327d7e83eaf485546c067a21 */
     [LAYER_ADJUST] = LAYOUT(
-        _______,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,  _______,  _______,  EEP_RST,  RESET,    _______,  _______,  _______,  _______,
+        _______,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,  _______,  _______,  EEP_RST,  RESET,    _______,  _______,  _______,  _______,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  _______,  _______,  _______,  RGB_RMOD, RGB_VAD,  RGB_VAI,  RGB_MOD,  RGB_SPI,  _______,
         _______,  _______,  _______,  KC_MUTE,  _______,  _______,  _______,  _______,  RGB_HUI,  RGB_SAD,  RGB_SAI,  RGB_HUD,  RGB_SPD,  _______,
         _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  RGB_TOG,  _______,  _______,  _______,  _______,  _______
     ),
     // clang-format on
 };
-
-layer_state_t layer_state_set_keymap(layer_state_t state) { return update_tri_layer_state(state, LAYER_LOWER, LAYER_RAISE, LAYER_ADJUST); }
diff --git a/keyboards/eco/keymaps/bcat/readme.md b/keyboards/eco/keymaps/bcat/readme.md
index 85e2615512..fd9e1bea73 100644
--- a/keyboards/eco/keymaps/bcat/readme.md
+++ b/keyboards/eco/keymaps/bcat/readme.md
@@ -39,6 +39,6 @@ nothing really useful to bind them to anyway.
 
 ## Adjust layer
 
-![Adjust layer layout](https://i.imgur.com/J2rOshm.png)
+![Adjust layer layout](https://i.imgur.com/63vm0ke.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/b18aafa0327d7e83eaf485546c067a21))
diff --git a/keyboards/keebio/bdn9/keymaps/bcat/keymap.c b/keyboards/keebio/bdn9/keymaps/bcat/keymap.c
index c64f702b20..2028deb4f1 100644
--- a/keyboards/keebio/bdn9/keymaps/bcat/keymap.c
+++ b/keyboards/keebio/bdn9/keymaps/bcat/keymap.c
@@ -16,21 +16,16 @@
 
 #include QMK_KEYBOARD_H
 
-enum layer {
-    LAYER_FIRST,
-    LAYER_SECOND,
-};
-
-#define LY_SECND MO(LAYER_SECOND)
+#include "bcat.h"
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
-    [LAYER_FIRST] = LAYOUT(
-        KC_MUTE,  LY_SECND, BL_BRTG,
+    [LAYER_DEFAULT] = LAYOUT(
+        KC_MUTE,  LY_FN1,   BL_BRTG,
         KC_F4,    KC_F5,    KC_F6,
         KC_F1,    KC_F2,    KC_F3
     ),
-    [LAYER_SECOND] = LAYOUT(
+    [LAYER_FUNCTION_1] = LAYOUT(
         EEP_RST,  _______,  RESET,
         KC_F10,   KC_F11,   KC_F12,
         KC_F7,    KC_F8,    KC_F9
diff --git a/keyboards/keebio/quefrency/keymaps/bcat/keymap.c b/keyboards/keebio/quefrency/keymaps/bcat/keymap.c
index d28a5083ac..3dd48623fa 100644
--- a/keyboards/keebio/quefrency/keymaps/bcat/keymap.c
+++ b/keyboards/keebio/quefrency/keymaps/bcat/keymap.c
@@ -16,12 +16,7 @@
 
 #include QMK_KEYBOARD_H
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_FUNCTION,
-};
-
-#define LY_FN MO(LAYER_FUNCTION)
+#include "bcat.h"
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
@@ -31,12 +26,12 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
         KC_TAB,   KC_Q,     KC_W,     KC_E,     KC_R,     KC_T,     KC_Y,     KC_U,     KC_I,     KC_O,     KC_P,     KC_LBRC,  KC_RBRC,  KC_BSPC,            KC_PGUP,
         KC_LCTL,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,     KC_SCLN,  KC_QUOT,            KC_ENT,             KC_PGDN,
         KC_LSFT,  KC_Z,     KC_X,     KC_C,     KC_V,     KC_B,     KC_N,     KC_M,     KC_COMM,  KC_DOT,   KC_SLSH,  KC_RSFT,                      KC_UP,    KC_END,
-        KC_LCTL,  KC_LGUI,  KC_LALT,  LY_FN,    KC_SPC,                       KC_SPC,   XXXXXXX,  KC_RALT,  LY_FN,    KC_RCTL,            KC_LEFT,  KC_DOWN,  KC_RGHT
+        KC_LCTL,  KC_LGUI,  KC_LALT,  LY_FN1,   KC_SPC,                       KC_SPC,   XXXXXXX,  KC_RALT,  LY_FN1,   KC_RCTL,            KC_LEFT,  KC_DOWN,  KC_RGHT
     ),
     /* Function layer: http://www.keyboard-layout-editor.com/#/gists/59636898946da51f91fb290f8e078b4d */
-    [LAYER_FUNCTION] = LAYOUT_65(
+    [LAYER_FUNCTION_1] = LAYOUT_65(
         _______,  KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_INS,   KC_DEL,   RGB_HUI,
-        KC_CAPS,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,  EEP_RST,  RESET,    KC_PSCR,  KC_SLCK,  KC_PAUS,  _______,  _______,  _______,            RGB_SAI,
+        KC_CAPS,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,  EEP_RST,  RESET,    KC_PSCR,  KC_SLCK,  KC_PAUS,  _______,  _______,  _______,            RGB_SAI,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            RGB_TOG,            RGB_SAD,
         _______,  KC_APP,   _______,  KC_MUTE,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,                      RGB_VAI,  RGB_HUD,
         _______,  _______,  _______,  _______,  _______,                      _______,  _______,  _______,  _______,  _______,            RGB_RMOD, RGB_VAD,  RGB_MOD
diff --git a/keyboards/keebio/quefrency/keymaps/bcat/readme.md b/keyboards/keebio/quefrency/keymaps/bcat/readme.md
index 914aa84b6b..59a691654d 100644
--- a/keyboards/keebio/quefrency/keymaps/bcat/readme.md
+++ b/keyboards/keebio/quefrency/keymaps/bcat/readme.md
@@ -12,6 +12,6 @@ ESDF cluster), and RGB controls in the function layer (on the arrow/nav keys).
 
 ## Function layer
 
-![Function layer layout](https://i.imgur.com/Fzshl0F.png)
+![Function layer layout](https://i.imgur.com/7oCdN86.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/59636898946da51f91fb290f8e078b4d))
diff --git a/keyboards/lily58/keymaps/bcat/config.h b/keyboards/lily58/keymaps/bcat/config.h
index dbe724d56b..2ee0071bda 100644
--- a/keyboards/lily58/keymaps/bcat/config.h
+++ b/keyboards/lily58/keymaps/bcat/config.h
@@ -16,4 +16,6 @@
 
 #pragma once
 
+#define BCAT_ORTHO_LAYERS
+
 #define EE_HANDS
diff --git a/keyboards/lily58/keymaps/bcat/keymap.c b/keyboards/lily58/keymaps/bcat/keymap.c
index 69af2ca003..a0856d0fdd 100644
--- a/keyboards/lily58/keymaps/bcat/keymap.c
+++ b/keyboards/lily58/keymaps/bcat/keymap.c
@@ -18,20 +18,9 @@
 
 #include "bcat.h"
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_LOWER,
-    LAYER_RAISE,
-    LAYER_ADJUST,
-};
-
-#define LY_LWR MO(LAYER_LOWER)
-#define LY_RSE MO(LAYER_RAISE)
-
-#define KY_CSPC LCTL(KC_SPC)
-#define KY_ZMIN LCTL(KC_EQL)
-#define KY_ZMOUT LCTL(KC_MINS)
-#define KY_ZMRST LCTL(KC_0)
+#if defined(OLED_ENABLE)
+#    include "bcat_oled.h"
+#endif
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
@@ -62,7 +51,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     /* Adjust layer: http://www.keyboard-layout-editor.com/#/gists/8f6a3f08350a9bbe1d414b22bca4e6c7 */
     [LAYER_ADJUST] = LAYOUT(
         _______,  _______,  _______,  _______,  _______,  _______,                      _______,  _______,  _______,  _______,  _______,  _______,
-        _______,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,                      EEP_RST,  RESET,    _______,  _______,  _______,  _______,
+        _______,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,                      EEP_RST,  RESET,    _______,  _______,  _______,  _______,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  _______,                      _______,  _______,  _______,  _______,  _______,  _______,
         _______,  _______,  _______,  KC_MUTE,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,
                                       _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______
@@ -70,4 +59,16 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format on
 };
 
-layer_state_t layer_state_set_keymap(layer_state_t state) { return update_tri_layer_state(state, LAYER_LOWER, LAYER_RAISE, LAYER_ADJUST); }
+#if defined(OLED_ENABLE)
+oled_rotation_t oled_init_user(oled_rotation_t rotation) { return is_keyboard_master() ? OLED_ROTATION_270 : OLED_ROTATION_180; }
+
+void oled_task_keymap(const oled_keyboard_state_t *keyboard_state) {
+    render_oled_layers();
+    oled_advance_page(/*clearPageRemainder=*/false);
+    render_oled_indicators(keyboard_state->leds);
+    oled_advance_page(/*clearPageRemainder=*/false);
+    oled_advance_page(/*clearPageRemainder=*/false);
+    render_oled_wpm(keyboard_state->wpm);
+    render_oled_pet(/*col=*/0, /*line=*/12, keyboard_state);
+}
+#endif
diff --git a/keyboards/lily58/keymaps/bcat/readme.md b/keyboards/lily58/keymaps/bcat/readme.md
index de03526a8b..8b0e77e1b7 100644
--- a/keyboards/lily58/keymaps/bcat/readme.md
+++ b/keyboards/lily58/keymaps/bcat/readme.md
@@ -37,6 +37,6 @@ back/forward navigation keys.
 
 ## Adjust layer
 
-![Adjust layer layout](https://i.imgur.com/Q3PGsiK.png)
+![Adjust layer layout](https://i.imgur.com/XC2eR2M.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/8f6a3f08350a9bbe1d414b22bca4e6c7))
diff --git a/keyboards/lily58/keymaps/bcat/rules.mk b/keyboards/lily58/keymaps/bcat/rules.mk
index c87b447c1e..62d1007a54 100644
--- a/keyboards/lily58/keymaps/bcat/rules.mk
+++ b/keyboards/lily58/keymaps/bcat/rules.mk
@@ -1 +1,3 @@
+BCAT_OLED_PET = luna
+
 BOOTLOADER = atmel-dfu  # Elite-C
diff --git a/layouts/community/60_ansi_split_bs_rshift/bcat/keymap.c b/layouts/community/60_ansi_split_bs_rshift/bcat/keymap.c
index 6bfafc3325..b40148e995 100644
--- a/layouts/community/60_ansi_split_bs_rshift/bcat/keymap.c
+++ b/layouts/community/60_ansi_split_bs_rshift/bcat/keymap.c
@@ -16,14 +16,7 @@
 
 #include QMK_KEYBOARD_H
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_FUNCTION_1,
-    LAYER_FUNCTION_2,
-};
-
-#define LY_FN1 MO(LAYER_FUNCTION_1)
-#define LY_FN2 MO(LAYER_FUNCTION_2)
+#include "bcat.h"
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
@@ -48,7 +41,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     /* Function 2 layer: http://www.keyboard-layout-editor.com/#/gists/6e1068e4f91bbacccaf5ac0acbeec79c */
     [LAYER_FUNCTION_2] = LAYOUT_60_ansi_split_bs_rshift(
         _______,  KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_INS,   KC_DEL,
-        _______,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  BL_BRTG,  EEP_RST,  RESET,    _______,  _______,  _______,  RGB_VAI,  _______,  _______,
+        _______,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  BL_BRTG,  EEP_RST,  RESET,    _______,  _______,  _______,  RGB_VAI,  _______,  _______,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  BL_INC,   _______,  RGB_SPI,  RGB_HUI,  RGB_SAI,  RGB_RMOD, RGB_MOD,            RGB_TOG,
         _______,  _______,  _______,  KC_MUTE,  _______,  BL_DEC,   _______,  RGB_SPD,  RGB_HUD,  RGB_SAD,  RGB_VAD,  _______,                      _______,
         _______,  _______,  _______,                                _______,                                          _______,  _______,  _______,  _______
diff --git a/layouts/community/60_ansi_split_bs_rshift/bcat/readme.md b/layouts/community/60_ansi_split_bs_rshift/bcat/readme.md
index 2d578aa3d3..f6bcda9197 100644
--- a/layouts/community/60_ansi_split_bs_rshift/bcat/readme.md
+++ b/layouts/community/60_ansi_split_bs_rshift/bcat/readme.md
@@ -19,6 +19,6 @@ layout](https://github.com/qmk/qmk_firmware/tree/master/layouts/community/60_tsa
 
 ## Function 2 layer
 
-![Function 2 layer layout](https://i.imgur.com/vJaCzVo.png)
+![Function 2 layer layout](https://i.imgur.com/DW03vvJ.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/6e1068e4f91bbacccaf5ac0acbeec79c))
diff --git a/layouts/community/60_tsangan_hhkb/bcat/keymap.c b/layouts/community/60_tsangan_hhkb/bcat/keymap.c
index 05e6462d90..9ec75f3c4d 100644
--- a/layouts/community/60_tsangan_hhkb/bcat/keymap.c
+++ b/layouts/community/60_tsangan_hhkb/bcat/keymap.c
@@ -16,14 +16,7 @@
 
 #include QMK_KEYBOARD_H
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_FUNCTION_1,
-    LAYER_FUNCTION_2,
-};
-
-#define LY_FN1 MO(LAYER_FUNCTION_1)
-#define LY_FN2 MO(LAYER_FUNCTION_2)
+#include "bcat.h"
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
@@ -46,7 +39,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     /* Function 2 layer: http://www.keyboard-layout-editor.com/#/gists/65ac939caec878401603bc36290852d4 */
     [LAYER_FUNCTION_2] = LAYOUT_60_tsangan_hhkb(
         _______,  KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_INS,   KC_DEL,
-        _______,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  BL_BRTG,  EEP_RST,  RESET,    _______,  _______,  _______,  RGB_VAI,  _______,  _______,
+        _______,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  BL_BRTG,  EEP_RST,  RESET,    _______,  _______,  _______,  RGB_VAI,  _______,  _______,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  BL_INC,   _______,  RGB_SPI,  RGB_HUI,  RGB_SAI,  RGB_RMOD, RGB_MOD,            RGB_TOG,
         _______,  _______,  _______,  KC_MUTE,  _______,  BL_DEC,   _______,  RGB_SPD,  RGB_HUD,  RGB_SAD,  RGB_VAD,  _______,                      _______,
         _______,  _______,  _______,                                _______,                                          _______,  _______,            _______
diff --git a/layouts/community/60_tsangan_hhkb/bcat/readme.md b/layouts/community/60_tsangan_hhkb/bcat/readme.md
index b7a3cde5d2..c8d0d72dd0 100644
--- a/layouts/community/60_tsangan_hhkb/bcat/readme.md
+++ b/layouts/community/60_tsangan_hhkb/bcat/readme.md
@@ -39,6 +39,6 @@ and/or blockers, so there aren't switches installed in those positions.
 
 ## Function 2 layer
 
-![Function 2 layer layout](https://i.imgur.com/vdNpFae.png)
+![Function 2 layer layout](https://i.imgur.com/4Jdw9eL.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/65ac939caec878401603bc36290852d4))
diff --git a/layouts/community/65_ansi_blocker_split_bs/bcat/keymap.c b/layouts/community/65_ansi_blocker_split_bs/bcat/keymap.c
index c91a1b0ead..c099d36e25 100644
--- a/layouts/community/65_ansi_blocker_split_bs/bcat/keymap.c
+++ b/layouts/community/65_ansi_blocker_split_bs/bcat/keymap.c
@@ -16,12 +16,7 @@
 
 #include QMK_KEYBOARD_H
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_FUNCTION,
-};
-
-#define LY_FN MO(LAYER_FUNCTION)
+#include "bcat.h"
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
@@ -31,13 +26,13 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
         KC_TAB,   KC_Q,     KC_W,     KC_E,     KC_R,     KC_T,     KC_Y,     KC_U,     KC_I,     KC_O,     KC_P,     KC_LBRC,  KC_RBRC,  KC_BSPC,            KC_PGUP,
         KC_LCTL,  KC_A,     KC_S,     KC_D,     KC_F,     KC_G,     KC_H,     KC_J,     KC_K,     KC_L,     KC_SCLN,  KC_QUOT,            KC_ENT,             KC_PGDN,
         KC_LSFT,  KC_Z,     KC_X,     KC_C,     KC_V,     KC_B,     KC_N,     KC_M,     KC_COMM,  KC_DOT,   KC_SLSH,  KC_RSFT,                      KC_UP,    KC_END,
-        KC_LCTL,  KC_LGUI,  KC_LALT,                      KC_SPC,                                 KC_RALT,  LY_FN,                        KC_LEFT,  KC_DOWN,  KC_RGHT
+        KC_LCTL,  KC_LGUI,  KC_LALT,                      KC_SPC,                                 KC_RALT,  LY_FN1,                       KC_LEFT,  KC_DOWN,  KC_RGHT
     ),
 
     /* Function layer: http://www.keyboard-layout-editor.com/#/gists/f29128427f674c43777f045e363d1b44 */
-    [LAYER_FUNCTION] = LAYOUT_65_ansi_blocker_split_bs(
+    [LAYER_FUNCTION_1] = LAYOUT_65_ansi_blocker_split_bs(
         _______,  KC_F1,    KC_F2,    KC_F3,    KC_F4,    KC_F5,    KC_F6,    KC_F7,    KC_F8,    KC_F9,    KC_F10,   KC_F11,   KC_F12,   KC_INS,   KC_DEL,   _______,
-        KC_CAPS,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,  EEP_RST,  RESET,    KC_PSCR,  KC_SLCK,  KC_PAUS,  _______,  _______,  _______,            _______,
+        KC_CAPS,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,  EEP_RST,  RESET,    KC_PSCR,  KC_SLCK,  KC_PAUS,  _______,  _______,  _______,            _______,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  _______,  _______,  _______,  _______,  _______,  _______,  _______,            _______,            _______,
         _______,  KC_APP,   _______,  KC_MUTE,  _______,  _______,  _______,  _______,  _______,  _______,  _______,  _______,                      _______,  _______,
         _______,  _______,  _______,                      _______,                                _______,  _______,                      _______,  _______,  _______
diff --git a/layouts/community/65_ansi_blocker_split_bs/bcat/readme.md b/layouts/community/65_ansi_blocker_split_bs/bcat/readme.md
index 0726cbecee..5777c7c38f 100644
--- a/layouts/community/65_ansi_blocker_split_bs/bcat/readme.md
+++ b/layouts/community/65_ansi_blocker_split_bs/bcat/readme.md
@@ -12,6 +12,6 @@ keys, an HHKB-style (split) backspace, and media controls in the function layer
 
 ## Function layer
 
-![Function layer layout](https://i.imgur.com/CsxfVfd.png)
+![Function layer layout](https://i.imgur.com/s4hS9ZK.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/f29128427f674c43777f045e363d1b44))
diff --git a/layouts/community/split_3x6_3/bcat/config.h b/layouts/community/split_3x6_3/bcat/config.h
index b8743429cf..556fb90d5f 100644
--- a/layouts/community/split_3x6_3/bcat/config.h
+++ b/layouts/community/split_3x6_3/bcat/config.h
@@ -16,12 +16,13 @@
 
 #pragma once
 
+#define BCAT_ORTHO_LAYERS
+
 #if defined(KEYBOARD_crkbd_rev1)
 #    define EE_HANDS
 
-#    if defined(RGB_MATRIX_ENABLE)
-/* Limit max RGB LED current to avoid tripping controller fuse. */
-#        undef RGB_MATRIX_MAXIMUM_BRIGHTNESS
-#        define RGB_MATRIX_MAXIMUM_BRIGHTNESS 150
+#    if defined(OLED_ENABLE)
+#        undef OLED_FONT_H
+#        define OLED_FONT_H "lib/glcdfont.c"
 #    endif
 #endif
diff --git a/layouts/community/split_3x6_3/bcat/keymap.c b/layouts/community/split_3x6_3/bcat/keymap.c
index 4f68c8f843..cfac93d1e3 100644
--- a/layouts/community/split_3x6_3/bcat/keymap.c
+++ b/layouts/community/split_3x6_3/bcat/keymap.c
@@ -18,20 +18,9 @@
 
 #include "bcat.h"
 
-enum layer {
-    LAYER_DEFAULT,
-    LAYER_LOWER,
-    LAYER_RAISE,
-    LAYER_ADJUST,
-};
-
-#define LY_LWR MO(LAYER_LOWER)
-#define LY_RSE MO(LAYER_RAISE)
-
-#define KY_CSPC LCTL(KC_SPC)
-#define KY_ZMIN LCTL(KC_EQL)
-#define KY_ZMOUT LCTL(KC_MINS)
-#define KY_ZMRST LCTL(KC_0)
+#if defined(OLED_ENABLE)
+#    include "bcat_oled.h"
+#endif
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format off
@@ -58,7 +47,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     ),
     /* Adjust layer: http://www.keyboard-layout-editor.com/#/gists/77e7572e077b36a23eb2086017e16fee */
     [LAYER_ADJUST] = LAYOUT_split_3x6_3(
-        _______,  NK_TOGG,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,                      EEP_RST,  RESET,    _______,  _______,  _______,  _______,
+        _______,  _______,  KC_MPLY,  KC_VOLU,  KC_MSTP,  _______,                      EEP_RST,  RESET,    _______,  _______,  _______,  _______,
         _______,  _______,  KC_MPRV,  KC_VOLD,  KC_MNXT,  _______,                      RGB_RMOD, RGB_VAD,  RGB_VAI,  RGB_MOD,  RGB_SPI,  _______,
         _______,  _______,  _______,  KC_MUTE,  _______,  _______,                      RGB_HUI,  RGB_SAD,  RGB_SAI,  RGB_HUD,  RGB_SPD,  _______,
                                                 _______,  _______,  _______,  RGB_TOG,  _______,  _______
@@ -66,4 +55,16 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     // clang-format on
 };
 
-layer_state_t layer_state_set_keymap(layer_state_t state) { return update_tri_layer_state(state, LAYER_LOWER, LAYER_RAISE, LAYER_ADJUST); }
+#if defined(OLED_ENABLE)
+oled_rotation_t oled_init_user(oled_rotation_t rotation) { return is_keyboard_master() ? OLED_ROTATION_270 : OLED_ROTATION_180; }
+
+void oled_task_keymap(const oled_keyboard_state_t *keyboard_state) {
+    render_oled_layers();
+    oled_advance_page(/*clearPageRemainder=*/false);
+    render_oled_indicators(keyboard_state->leds);
+    oled_advance_page(/*clearPageRemainder=*/false);
+    oled_advance_page(/*clearPageRemainder=*/false);
+    render_oled_wpm(keyboard_state->wpm);
+    render_oled_pet(/*col=*/0, /*line=*/12, keyboard_state);
+}
+#endif
diff --git a/layouts/community/split_3x6_3/bcat/readme.md b/layouts/community/split_3x6_3/bcat/readme.md
index c4bf891c40..b7b5d3de7d 100644
--- a/layouts/community/split_3x6_3/bcat/readme.md
+++ b/layouts/community/split_3x6_3/bcat/readme.md
@@ -117,7 +117,7 @@ better location.
 
 ## Adjust layer
 
-![Adjust layer layout](https://i.imgur.com/fZouko5.png)
+![Adjust layer layout](https://i.imgur.com/Q4rN6cQ.png)
 
 ([KLE](http://www.keyboard-layout-editor.com/#/gists/77e7572e077b36a23eb2086017e16fee))
 
diff --git a/layouts/community/split_3x6_3/bcat/rules.mk b/layouts/community/split_3x6_3/bcat/rules.mk
index 5ee614b192..29e52b92db 100644
--- a/layouts/community/split_3x6_3/bcat/rules.mk
+++ b/layouts/community/split_3x6_3/bcat/rules.mk
@@ -1,5 +1,9 @@
+BCAT_OLED_PET = luna
+
 ifeq ($(strip $(KEYBOARD)), crkbd/rev1)
 	BOOTLOADER = atmel-dfu  # Elite-C
 
+	OLED_ENABLE = yes  # dual 128x32 OLED screens
+	OLED_DRIVER = SSD1306
 	RGB_MATRIX_ENABLE = yes  # per-key RGB and underglow
 endif
diff --git a/users/bcat/bcat.c b/users/bcat/bcat.c
index f21d282e43..3a407cfac0 100644
--- a/users/bcat/bcat.c
+++ b/users/bcat/bcat.c
@@ -16,16 +16,15 @@
 
 #include "bcat.h"
 
-#if defined(RGBLIGHT_ENABLE)
-/* Adjust RGB static hue ranges for shorter gradients than default. */
-const uint8_t RGBLED_GRADIENT_RANGES[] PROGMEM = {255, 127, 63, 31, 15};
-#endif
+#include "quantum.h"
 
 static int8_t alt_tab_layer = -1;
 
+__attribute__((weak)) void process_record_oled(uint16_t keycode, const keyrecord_t *record) {}
 __attribute__((weak)) bool process_record_keymap(uint16_t keycode, keyrecord_t *record) { return true; }
 
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    process_record_oled(keycode, record);
     if (!process_record_keymap(keycode, record)) {
         return false;
     }
@@ -51,6 +50,9 @@ __attribute__((weak)) layer_state_t layer_state_set_keymap(layer_state_t state)
 
 layer_state_t layer_state_set_user(layer_state_t state) {
     state = layer_state_set_keymap(state);
+#if defined(BCAT_ORTHO_LAYERS)
+    state = update_tri_layer_state(state, LAYER_LOWER, LAYER_RAISE, LAYER_ADJUST);
+#endif
     if (alt_tab_layer >= 0 && !layer_state_cmp(state, alt_tab_layer)) {
         unregister_code(KC_LALT);
         alt_tab_layer = -1;
diff --git a/users/bcat/bcat.h b/users/bcat/bcat.h
index 0dae774ec5..4a88acba7d 100644
--- a/users/bcat/bcat.h
+++ b/users/bcat/bcat.h
@@ -16,9 +16,43 @@
 
 #pragma once
 
-#include "quantum.h"
+#include <stdbool.h>
 
+#include "keymap.h"
+
+/* Layer numbers shared across keymaps. */
+enum user_layer {
+    /* Base layers: */
+    LAYER_DEFAULT,
+
+#if defined(BCAT_ORTHO_LAYERS)
+    /* Function layers for ortho (and ergo) boards: */
+    LAYER_LOWER,
+    LAYER_RAISE,
+    LAYER_ADJUST,
+#else
+    /* Function layers for traditional boards: */
+    LAYER_FUNCTION_1,
+    LAYER_FUNCTION_2,
+#endif
+};
+
+/* Custom keycodes shared across keymaps. */
 enum user_keycode {
     MC_ALTT = SAFE_RANGE,
     KEYMAP_SAFE_RANGE,
 };
+
+/* Keycode aliases shared across keymaps. */
+#define KY_CSPC LCTL(KC_SPC)
+#define KY_ZMIN LCTL(KC_EQL)
+#define KY_ZMOUT LCTL(KC_MINS)
+#define KY_ZMRST LCTL(KC_0)
+
+#if defined(BCAT_ORTHO_LAYERS)
+#    define LY_LWR MO(LAYER_LOWER)
+#    define LY_RSE MO(LAYER_RAISE)
+#else
+#    define LY_FN1 MO(LAYER_FUNCTION_1)
+#    define LY_FN2 MO(LAYER_FUNCTION_2)
+#endif
diff --git a/users/bcat/bcat_oled.c b/users/bcat/bcat_oled.c
new file mode 100644
index 0000000000..390c9127b4
--- /dev/null
+++ b/users/bcat/bcat_oled.c
@@ -0,0 +1,216 @@
+/* Copyright 2021 Jonathan Rascher
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bcat_oled.h"
+
+#include "quantum.h"
+#include "bcat.h"
+
+#if defined(BCAT_OLED_PET)
+#    include "bcat_oled_pet.h"
+#endif
+
+#define TRIANGLE_UP 0x1e
+#define TRIANGLE_DOWN 0x1f
+
+#if defined(BCAT_OLED_PET)
+static bool oled_pet_should_jump = false;
+#endif
+
+/* Should be overridden by the keymap to render the OLED contents. For split
+ * keyboards, this function is only called on the master side.
+ */
+__attribute__((weak)) void oled_task_keymap(const oled_keyboard_state_t *keyboard_state) {}
+
+bool oled_task_user(void) {
+#if defined(SPLIT_KEYBOARD)
+    if (is_keyboard_master()) {
+#endif
+        /* Custom OLED timeout implementation that only considers user activity.
+         * Allows the OLED to turn off in the middle of a continuous animation.
+         */
+        static const uint16_t TIMEOUT_MILLIS = 60000 /* 1 min */;
+
+        if (last_input_activity_elapsed() < TIMEOUT_MILLIS) {
+            if (!is_oled_on()) {
+                oled_on();
+            }
+            oled_keyboard_state_t keyboard_state = {
+                .mods = get_mods(),
+                .leds = host_keyboard_led_state(),
+                .wpm  = get_current_wpm(),
+            };
+            oled_task_keymap(&keyboard_state);
+        } else if (is_oled_on()) {
+            oled_off();
+        }
+#if defined(SPLIT_KEYBOARD)
+    } else {
+        /* Display logo embedded at standard location in the OLED font on the
+         * slave side. By default, this is a "QMK firmware" logo, but many
+         * keyboards substitute their own logo. Occupies 21x3 character cells.
+         *
+         * Since the slave display buffer never changes, we don't need to worry
+         * about oled_render incorrectly turning the OLED on. Instead, we rely
+         * on SPLIT_OLED_ENABLE to propagate OLED on/off status from master.
+         */
+        static const char PROGMEM logo[] = {
+            // clang-format off
+            0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94,
+            0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4,
+            0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4,
+            0x00,
+            // clang-format on
+        };
+
+        oled_write_P(logo, /*invert=*/false);
+    }
+#endif
+
+    return false;
+}
+
+void render_oled_layers(void) {
+    oled_advance_char();
+    oled_advance_char();
+#if defined(BCAT_ORTHO_LAYERS)
+    oled_write_char(IS_LAYER_ON(LAYER_LOWER) ? TRIANGLE_DOWN : ' ', /*invert=*/false);
+    oled_advance_char();
+    oled_write_char(IS_LAYER_ON(LAYER_RAISE) ? TRIANGLE_UP : ' ', /*invert=*/false);
+#else
+    switch (get_highest_layer(layer_state)) {
+        case LAYER_FUNCTION_1:
+            oled_write_P(PSTR("FN1"), /*invert=*/false);
+            break;
+        case LAYER_FUNCTION_2:
+            oled_write_P(PSTR("FN2"), /*invert=*/false);
+            break;
+        default:
+            oled_write_P(PSTR("   "), /*invert=*/false);
+            break;
+    }
+#endif
+}
+
+void render_oled_indicators(led_t leds) {
+    oled_advance_char();
+    oled_advance_char();
+    oled_write_P(leds.num_lock ? PSTR("NUM") : PSTR("   "), /*invert=*/false);
+    oled_advance_char();
+    oled_advance_char();
+    oled_write_P(leds.caps_lock ? PSTR("CAP") : PSTR("   "), /*invert=*/false);
+    oled_advance_char();
+    oled_advance_char();
+    oled_write_P(leds.scroll_lock ? PSTR("SCR") : PSTR("   "), /*invert=*/false);
+}
+
+void render_oled_wpm(uint8_t wpm) {
+    static const uint16_t UPDATE_MILLIS  = 100;
+    static uint32_t       update_timeout = 0;
+
+    if (timer_expired32(timer_read32(), update_timeout)) {
+        oled_advance_char();
+        oled_advance_char();
+        oled_write_P(wpm > 0 ? PSTR("WPM") : PSTR("   "), /*invert=*/false);
+        if (wpm > 0) {
+            oled_advance_char();
+            oled_advance_char();
+            oled_write(get_u8_str(wpm, ' '), /*invert=*/false);
+        } else {
+            oled_advance_page(/*clearPageRemainder=*/true);
+        }
+
+        update_timeout = timer_read32() + UPDATE_MILLIS;
+    }
+}
+
+#if defined(BCAT_OLED_PET)
+void process_record_oled(uint16_t keycode, const keyrecord_t *record) {
+    switch (keycode) {
+        case KC_SPACE:
+            if (oled_pet_can_jump()) {
+                oled_pet_should_jump = record->event.pressed;
+            }
+            break;
+        default:
+            break;
+    }
+}
+
+static void redraw_oled_pet(uint8_t col, uint8_t line, bool jumping, oled_pet_state_t state) {
+    oled_set_cursor(col, line);
+    if (jumping) {
+        oled_write_raw_P(oled_pet_frame(state), oled_pet_frame_bytes());
+        oled_set_cursor(col, line + oled_pet_frame_lines());
+        oled_advance_page(/*clearPageRemainder=*/true);
+    } else {
+        oled_advance_page(/*clearPageRemainder=*/true);
+        oled_write_raw_P(oled_pet_frame(state), oled_pet_frame_bytes());
+    }
+}
+
+void render_oled_pet(uint8_t col, uint8_t line, const oled_keyboard_state_t *keyboard_state) {
+    /* Current animation to draw. We track changes to avoid redrawing the same
+     * frame repeatedly, allowing oled_pet_post_render to draw over the
+     * animation frame.
+     */
+    static oled_pet_state_t state         = 0;
+    static bool             state_changed = true;
+
+    /* Minimum time until the pet comes down after jumping. */
+    static const uint16_t JUMP_MILLIS = 200;
+    static bool           jumping     = false;
+
+    /* Time until the next animation or jump state change. */
+    static uint32_t update_timeout = 0;
+    static uint32_t jump_timeout   = 0;
+
+    /* If the user pressed the jump key, immediately redraw instead of waiting
+     * for the animation frame to update. That way, the pet appears to respond
+     * to jump commands quickly rather than lagging. If the user released the
+     * jump key, wait for the jump timeout to avoid overly brief jumps.
+     */
+    bool redraw = state_changed;
+    if (oled_pet_should_jump && !jumping) {
+        redraw       = true;
+        jumping      = true;
+        jump_timeout = timer_read32() + JUMP_MILLIS;
+    } else if (!oled_pet_should_jump && jumping && timer_expired32(timer_read32(), jump_timeout)) {
+        redraw  = true;
+        jumping = false;
+    }
+
+    /* Draw the actual animation, then move the cursor to the end of the
+     * rendered area. (Note that we take up an extra line to account for
+     * jumping, which shifts the animation up or down a line.)
+     */
+    if (redraw) {
+        redraw_oled_pet(col, line, jumping, state);
+    }
+    oled_pet_post_render(col, line + !jumping, keyboard_state, redraw);
+    oled_set_cursor(col, line + oled_pet_frame_lines() + 1);
+
+    /* If the update timer expired, recompute the pet's animation state. */
+    if (timer_expired32(timer_read32(), update_timeout)) {
+        oled_pet_state_t new_state = oled_pet_next_state(state, keyboard_state);
+        state_changed              = new_state != state;
+        state                      = new_state;
+        update_timeout             = timer_read32() + oled_pet_update_millis(keyboard_state);
+    } else {
+        state_changed = false;
+    }
+}
+#endif
diff --git a/users/bcat/bcat_oled.h b/users/bcat/bcat_oled.h
new file mode 100644
index 0000000000..f617e1f064
--- /dev/null
+++ b/users/bcat/bcat_oled.h
@@ -0,0 +1,55 @@
+/* Copyright 2021 Jonathan Rascher
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "led.h"
+
+/* Keyboard status passed to the oled_task_keymap function and used by the
+ * various keyboard pet implementations.
+ */
+typedef struct {
+    uint8_t mods;
+    led_t   leds;
+    uint8_t wpm;
+} oled_keyboard_state_t;
+
+/* Note: Functions below assume a vertical OLED that is 32px (5 chars) wide. */
+
+/* Renders layer status at the cursor. Occupies 5x1 character cells. */
+void render_oled_layers(void);
+
+/* Renders LED indicators (Num/Caps/Scroll Lock) at the cursor. Occupies 5x3
+ * character cells.
+ */
+void render_oled_indicators(led_t leds);
+
+/* Renders calculated WPM count at the cursor. Occupies 5x2 character cells. */
+void render_oled_wpm(uint8_t wpm);
+
+#if defined(BCAT_OLED_PET)
+/* Renders an animated critter at the cursor that can respond to keystrokes,
+ * typing speed, etc. Should be about 5 character cells wide, but exact height
+ * varies depending on the specific OLED pet implementation linked in.
+ *
+ * The rendered image will be one line taller than the OLED pet's animation
+ * frame height to accommodate pets that "jump" when the spacebar is pressed.
+ */
+void render_oled_pet(uint8_t col, uint8_t line, const oled_keyboard_state_t *keyboard_state);
+#endif
diff --git a/users/bcat/bcat_oled_pet.h b/users/bcat/bcat_oled_pet.h
new file mode 100644
index 0000000000..ba8227ab61
--- /dev/null
+++ b/users/bcat/bcat_oled_pet.h
@@ -0,0 +1,73 @@
+/* Copyright 2021 Jonathan Rascher
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Common interface for an OLED pet (animated critter that reacts to typing).
+ * Please link exactly one accompanying .c file to implement these functions.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "bcat_oled.h"
+
+/* Opaque token representing a single frame of the OLED pet animation.
+ * Different pet implementations have different valid state values, but the
+ * zero value must always represent the default state of the pet at startup.
+ */
+typedef uint16_t oled_pet_state_t;
+
+/* Returns the number of bytes used to represent the animation frame (in
+ * oled_write_raw_P format). Note that every state the pet supports is expected
+ * to have the same frame size.
+ */
+uint16_t oled_pet_frame_bytes(void);
+
+/* Returns the number of lines of the OLED occupied by the animation. Note that
+ * every state the pet supports is expected to have the same frame size. The
+ * returned value does not include the one line of padding that render_oled_pet
+ * uses to account for "jumping".
+ */
+uint8_t oled_pet_frame_lines(void);
+
+/* Returns whether or not the OLED pet should "jump" when the spacebar is
+ * pressed. (The render_oled_pet implementation shifts the animation frame up
+ * one line when this happens.)
+ */
+bool oled_pet_can_jump(void);
+
+/* Returns the delay before the next animation frame should be displayed. */
+uint16_t oled_pet_update_millis(const oled_keyboard_state_t *keyboard_state);
+
+/* Returns the state of the pet to be animated on the next animation tick. */
+oled_pet_state_t oled_pet_next_state(oled_pet_state_t state, const oled_keyboard_state_t *keyboard_state);
+
+/* Called after the OLED pet is rendered during each OLED task invocation.
+ * Receives the same keyboard state as render_oled_pet. The redraw param
+ * indicates whether or not an OLED frame was just redrawn, allowing a specific
+ * pet implementation to draw custom things atop its animation frames.
+ *
+ * When this function is called, the cursor will be in an unspecified location,
+ * not necessarily the top-left corner of the OLED pet.
+ */
+void oled_pet_post_render(uint8_t col, uint8_t line, const oled_keyboard_state_t *keyboard_state, bool redraw);
+
+/* Returns a PROGMEM pointer to the specified frame buffer for the specified
+ * state. The animation frame has length given by oled_pet_frame_bytes and is
+ * formatted as expected by oled_write_raw_P.
+ */
+const char *oled_pet_frame(oled_pet_state_t state);
diff --git a/users/bcat/bcat_oled_pet_isda.c b/users/bcat/bcat_oled_pet_isda.c
new file mode 100644
index 0000000000..98abddb13b
--- /dev/null
+++ b/users/bcat/bcat_oled_pet_isda.c
@@ -0,0 +1,134 @@
+/* Copyright 2018 sparrow666
+ * Copyright 2021 Jonathan Rascher
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* OLED pet "Isda" (animated unicorn) featuring artwork by OpenGameArt user
+ * sparrow666, licensed under GPL v2.0.
+ *
+ * The animation is 32x72 pixels (9 lines tall).
+ *
+ * Runs faster the quicker you type. Shows LED indicator (Num/Caps/Scroll Lock)
+ * status in the bottom-right corner.
+ *
+ * Named after the goddess Ehlonna's personal unicorn in the first D&D campaign
+ * I ever played. :)
+ *
+ * Artwork source: https://opengameart.org/content/unicorn-2
+ */
+
+#include "bcat_oled_pet.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "bcat_oled.h"
+#include "led.h"
+#include "oled_driver.h"
+#include "progmem.h"
+
+#define NUM_FRAMES 4
+#define FRAME_BYTES 288 /* (32 pixel) * (72 pixel) / (8 pixel/byte) */
+
+uint16_t oled_pet_frame_bytes(void) { return FRAME_BYTES; }
+uint8_t  oled_pet_frame_lines(void) { return 9 /* (72 pixel) / (8 pixel/line) */; }
+bool     oled_pet_can_jump(void) { return false; }
+
+uint16_t oled_pet_update_millis(const oled_keyboard_state_t *keyboard_state) {
+    static const uint16_t MIN_MILLIS = 75;
+    static const uint16_t MAX_MILLIS = 300;
+    static const uint8_t  MAX_WPM    = 150;
+    uint8_t               wpm        = keyboard_state->wpm;
+    if (wpm > MAX_WPM) {
+        wpm = MAX_WPM;
+    }
+    return MAX_MILLIS - (MAX_MILLIS - MIN_MILLIS) * wpm / MAX_WPM;
+}
+
+oled_pet_state_t oled_pet_next_state(oled_pet_state_t state, const oled_keyboard_state_t *keyboard_state) {
+    /* When the user stops typing, cycle the animation to frame 0 and stop. */
+    return state != 0 || keyboard_state->wpm > 0 ? (state + 1) % NUM_FRAMES : 0;
+}
+
+void oled_pet_post_render(uint8_t col, uint8_t line, const oled_keyboard_state_t *keyboard_state, bool redraw) {
+    /* Draws LED indicator status in the bottom-right corner of the OLED pet,
+     * atop the animation frame. Redrawn only when necessary, e.g., when LED
+     * status changes or the animation itself updated (which overwrites any
+     * previously drawn indicators).
+     */
+    static led_t prev_leds = {.raw = 0};
+    led_t        leds      = keyboard_state->leds;
+    if (redraw || leds.raw != prev_leds.raw) {
+        oled_set_cursor(col + 4, line + 4);
+        oled_write_char(leds.num_lock ? 'N' : ' ', /*invert=*/false);
+        oled_set_cursor(col + 4, line + 6);
+        oled_write_char(leds.caps_lock ? 'C' : ' ', /*invert=*/false);
+        oled_set_cursor(col + 4, line + 8);
+        oled_write_char(leds.scroll_lock ? 'S' : ' ', /*invert=*/false);
+        prev_leds = leds;
+    }
+}
+
+const char *oled_pet_frame(oled_pet_state_t state) {
+    static const char PROGMEM FRAMES[NUM_FRAMES][FRAME_BYTES] = {
+        // clang-format off
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0xa0, 0x60, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x88, 0xd0, 0x78, 0x04, 0x28, 0x70, 0x60, 0x90, 0x88, 0xc4, 0x22, 0x19, 0x04, 0x03, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xfc, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x84, 0x8c, 0x08, 0x01, 0x01, 0x02, 0x02, 0x04, 0x88, 0xf0, 0x00,
+            0xc0, 0xe0, 0xe0, 0x10, 0x10, 0x08, 0x04, 0x02, 0x01, 0xff, 0xff, 0xff, 0x7f, 0x0f, 0x1f, 0x00, 0x00, 0x00, 0xf8, 0x07, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00,
+            0x00, 0x0f, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x80, 0xe0, 0x18, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xfc, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x3c, 0x0f, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x01, 0x03, 0xc6, 0x3c, 0x00, 0x80, 0x70, 0x1c, 0x0f, 0x03, 0x0f, 0x3f, 0xff, 0xff, 0xfc, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0xff, 0x00, 0x00, 0x80, 0xe0, 0xf8, 0xfe, 0x7f, 0x1f, 0x07, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x01, 0x0e, 0x30, 0x40, 0x47, 0x4f, 0x77, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0xc0, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x10, 0xa0, 0xf0, 0x08, 0x50, 0xe0, 0xc0, 0x20, 0x10, 0x88, 0x44, 0x32, 0x09, 0x06, 0x01, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf8, 0xfe, 0xff, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x08, 0x19, 0x11, 0x03, 0x02, 0x04, 0x04, 0x08, 0x10, 0xe0, 0x00,
+            0xc0, 0xe0, 0xe0, 0x10, 0x10, 0x08, 0x04, 0x02, 0x01, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x3f, 0x00, 0x00, 0x00, 0xf0, 0x0f, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x00,
+            0x00, 0x1f, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x01, 0x03, 0x00, 0x00, 0x80, 0xc0, 0x20, 0x10, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x3c, 0x0f, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x01, 0x03, 0xc6, 0x3c, 0x00, 0x80, 0x70, 0x18, 0x0f, 0x03, 0x0f, 0x3f, 0xff, 0xff, 0xfc, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xc0, 0x38, 0x07, 0xc0, 0x38, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0f, 0x7f, 0xff, 0xff, 0xe0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x21, 0x20, 0x1e, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x0f, 0x0f, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0xc0, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x10, 0xa0, 0xf0, 0x08, 0x50, 0xe0, 0xc0, 0x20, 0x10, 0x88, 0x44, 0x32, 0x09, 0x06, 0x01, 0x00, 0x00,
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+            0xc0, 0xc0, 0xc0, 0x20, 0x20, 0x10, 0x08, 0x04, 0x03, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x3f, 0x00, 0x00, 0x00, 0xf0, 0x0f, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x00,
+            0x00, 0x1f, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x01, 0x03, 0x00, 0x00, 0x80, 0xc0, 0x20, 0x10, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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+            0x01, 0x03, 0xc3, 0xfe, 0xfe, 0xfc, 0x7c, 0x1c, 0x0c, 0x0c, 0x08, 0x10, 0x60, 0x83, 0x07, 0x18, 0x60, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x71, 0x0e, 0x80, 0x70, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x01, 0x0f, 0x3f, 0x7f, 0x7f, 0x78, 0xe0, 0x90, 0x88, 0x66, 0x11, 0x08, 0x06, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0xa0, 0x60, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x88, 0xd0, 0x78, 0x04, 0x28, 0x70, 0x60, 0x90, 0x88, 0xc4, 0x22, 0x19, 0x04, 0x03, 0x00, 0x00, 0x00,
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+            0xc0, 0xe0, 0xe0, 0x10, 0x10, 0x08, 0x04, 0x02, 0x01, 0xff, 0xff, 0xff, 0x7f, 0x0f, 0x1f, 0x00, 0x00, 0x00, 0xf8, 0x07, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00,
+            0x00, 0x0f, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x80, 0xe0, 0x18, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0xe0, 0xfc, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7c, 0xff, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x01, 0x03, 0xc6, 0xfc, 0xfc, 0xfc, 0x7c, 0x18, 0x08, 0x08, 0x08, 0x30, 0xc0, 0x03, 0x0c, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0xc0, 0xf8, 0xff, 0xff, 0x3f, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0e, 0x70, 0x80, 0x1f, 0x60, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x18, 0x3e, 0x3f, 0x3f, 0x1f, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x0c, 0x09, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        // clang-format on
+    };
+    return FRAMES[state];
+}
diff --git a/users/bcat/bcat_oled_pet_luna.c b/users/bcat/bcat_oled_pet_luna.c
new file mode 100644
index 0000000000..f0397c9c05
--- /dev/null
+++ b/users/bcat/bcat_oled_pet_luna.c
@@ -0,0 +1,168 @@
+/* Copyright 2021 HellSingCoder
+ * Copyright 2021 Jonathan Rascher
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* OLED pet "Luna" (animated doggo) originally by HellSingCoder
+ * (https://www.simonepellegrino.com/) and licensed under GPL v2.0, adapted to
+ * fit the OLED pet framework in bcat's userspace.
+ *
+ * The animation is 32x24 pixels (3 lines tall).
+ *
+ * Walks or runs in response to typing speed. Sneaks when Ctrl is pressed and
+ * barks when Caps Lock is on. Jumps when space is pressed.
+ *
+ * Original source:
+ * https://github.com/qmk/qmk_firmware/blob/6dfe915e26d7147e6c2bed495d3b01cf5b21e6ec/keyboards/sofle/keymaps/helltm/keymap.c
+ */
+
+#include "bcat_oled_pet.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "bcat_oled.h"
+#include "keycode.h"
+#include "progmem.h"
+
+enum image {
+    IMAGE_IDLE,
+    IMAGE_WALK,
+    IMAGE_RUN,
+    IMAGE_SNEAK,
+    IMAGE_BARK,
+};
+
+typedef union {
+    oled_pet_state_t raw;
+    struct {
+        uint8_t image;
+        uint8_t frame;
+    };
+} luna_state_t;
+
+#define NUM_FRAMES 2
+#define FRAME_BYTES 96 /* (32 pixel) * (24 pixel) / (8 pixel/byte) */
+
+uint16_t oled_pet_frame_bytes(void) { return FRAME_BYTES; }
+uint8_t  oled_pet_frame_lines(void) { return 3 /* (24 pixel) / (8 pixel/line) */; }
+bool     oled_pet_can_jump(void) { return true; }
+
+uint16_t oled_pet_update_millis(const oled_keyboard_state_t *keyboard_state) { return 200; }
+
+oled_pet_state_t oled_pet_next_state(oled_pet_state_t state, const oled_keyboard_state_t *keyboard_state) {
+    luna_state_t luna_state = {.raw = state};
+    if (keyboard_state->leds.caps_lock) {
+        luna_state.image = IMAGE_BARK;
+    } else if (keyboard_state->mods & MOD_MASK_CTRL) {
+        luna_state.image = IMAGE_SNEAK;
+    } else if (keyboard_state->wpm >= 100) {
+        luna_state.image = IMAGE_RUN;
+    } else if (keyboard_state->wpm >= 25) {
+        luna_state.image = IMAGE_WALK;
+    } else {
+        luna_state.image = IMAGE_IDLE;
+    }
+    luna_state.frame = (luna_state.frame + 1) % NUM_FRAMES;
+    return luna_state.raw;
+}
+
+void oled_pet_post_render(uint8_t col, uint8_t line, const oled_keyboard_state_t *keyboard_state, bool redraw) {}
+
+const char *oled_pet_frame(oled_pet_state_t state) {
+    static const char PROGMEM IDLE_FRAMES[NUM_FRAMES][FRAME_BYTES] = {
+        // clang-format off
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x1c, 0x02, 0x05, 0x02, 0x24, 0x04, 0x04, 0x02, 0xa9, 0x1e, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x10, 0x08, 0x68, 0x10, 0x08, 0x04, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x06, 0x82, 0x7c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x04, 0x0c, 0x10, 0x10, 0x20, 0x20, 0x20, 0x28, 0x3e, 0x1c, 0x20, 0x20, 0x3e, 0x0f, 0x11, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x1c, 0x02, 0x05, 0x02, 0x24, 0x04, 0x04, 0x02, 0xa9, 0x1e, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x90, 0x08, 0x18, 0x60, 0x10, 0x08, 0x04, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x0e, 0x82, 0x7c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x04, 0x0c, 0x10, 0x10, 0x20, 0x20, 0x20, 0x28, 0x3e, 0x1c, 0x20, 0x20, 0x3e, 0x0f, 0x11, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        // clang-format on
+    };
+    static const char PROGMEM WALK_FRAMES[NUM_FRAMES][FRAME_BYTES] = {
+        // clang-format off
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0x20, 0x10, 0x90, 0x90, 0x90, 0xa0, 0xc0, 0x80, 0x80, 0x80, 0x70, 0x08, 0x14, 0x08, 0x90, 0x10, 0x10, 0x08, 0xa4, 0x78, 0x80, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x08, 0xfc, 0x01, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x18, 0xea, 0x10, 0x0f, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x1c, 0x20, 0x20, 0x3c, 0x0f, 0x11, 0x1f, 0x03, 0x06, 0x18, 0x20, 0x20, 0x3c, 0x0c, 0x12, 0x1e, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0x20, 0x20, 0x20, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x10, 0x28, 0x10, 0x20, 0x20, 0x20, 0x10, 0x48, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x20, 0xf8, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x10, 0x30, 0xd5, 0x20, 0x1f, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x20, 0x30, 0x0c, 0x02, 0x05, 0x09, 0x12, 0x1e, 0x02, 0x1c, 0x14, 0x08, 0x10, 0x20, 0x2c, 0x32, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        // clang-format on
+    };
+    static const char PROGMEM RUN_FRAMES[NUM_FRAMES][FRAME_BYTES] = {
+        // clang-format off
+        {
+            0x00, 0x00, 0x00, 0x00, 0xe0, 0x10, 0x08, 0x08, 0xc8, 0xb0, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x40, 0x40, 0x3c, 0x14, 0x04, 0x08, 0x90, 0x18, 0x04, 0x08, 0xb0, 0x40, 0x80, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0xc4, 0xa4, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc8, 0x58, 0x28, 0x2a, 0x10, 0x0f, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x0e, 0x09, 0x04, 0x04, 0x04, 0x04, 0x02, 0x03, 0x02, 0x01, 0x01, 0x02, 0x02, 0x04, 0x08, 0x10, 0x26, 0x2b, 0x32, 0x04, 0x05, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0xe0, 0x10, 0x10, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x78, 0x28, 0x08, 0x10, 0x20, 0x30, 0x08, 0x10, 0x20, 0x40, 0x80, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x03, 0x04, 0x08, 0x10, 0x11, 0xf9, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x10, 0xb0, 0x50, 0x55, 0x20, 0x1f, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x0c, 0x10, 0x20, 0x28, 0x37, 0x02, 0x1e, 0x20, 0x20, 0x18, 0x0c, 0x14, 0x1e, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        // clang-format on
+    };
+    static const char PROGMEM SNEAK_FRAMES[NUM_FRAMES][FRAME_BYTES] = {
+        // clang-format off
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0x40, 0x40, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x40, 0x40, 0x80, 0x00, 0x80, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x1e, 0x21, 0xf0, 0x04, 0x02, 0x02, 0x02, 0x02, 0x03, 0x02, 0x02, 0x04, 0x04, 0x04, 0x03, 0x01, 0x00, 0x00, 0x09, 0x01, 0x80, 0x80, 0xab, 0x04, 0xf8, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x1c, 0x20, 0x20, 0x3c, 0x0f, 0x11, 0x1f, 0x02, 0x06, 0x18, 0x20, 0x20, 0x38, 0x08, 0x10, 0x18, 0x04, 0x04, 0x02, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0x40, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe0, 0xa0, 0x20, 0x40, 0x80, 0xc0, 0x20, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x3e, 0x41, 0xf0, 0x04, 0x02, 0x02, 0x02, 0x03, 0x02, 0x02, 0x02, 0x04, 0x04, 0x02, 0x01, 0x00, 0x00, 0x00, 0x04, 0x00, 0x40, 0x40, 0x55, 0x82, 0x7c, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x20, 0x30, 0x0c, 0x02, 0x05, 0x09, 0x12, 0x1e, 0x04, 0x18, 0x10, 0x08, 0x10, 0x20, 0x28, 0x34, 0x06, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        // clang-format on
+    };
+    static const char PROGMEM BARK_FRAMES[NUM_FRAMES][FRAME_BYTES] = {
+        // clang-format off
+        {
+            0x00, 0xc0, 0x20, 0x10, 0xd0, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x40, 0x3c, 0x14, 0x04, 0x08, 0x90, 0x18, 0x04, 0x08, 0xb0, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x03, 0x04, 0x08, 0x10, 0x11, 0xf9, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc8, 0x48, 0x28, 0x2a, 0x10, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x0c, 0x10, 0x20, 0x28, 0x37, 0x02, 0x02, 0x04, 0x08, 0x10, 0x26, 0x2b, 0x32, 0x04, 0x05, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        {
+            0x00, 0xe0, 0x10, 0x10, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x40, 0x40, 0x2c, 0x14, 0x04, 0x08, 0x90, 0x18, 0x04, 0x08, 0xb0, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x03, 0x04, 0x08, 0x10, 0x11, 0xf9, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0x48, 0x28, 0x2a, 0x10, 0x0f, 0x20, 0x4a, 0x09, 0x10,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x0c, 0x10, 0x20, 0x28, 0x37, 0x02, 0x02, 0x04, 0x08, 0x10, 0x26, 0x2b, 0x32, 0x04, 0x05, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        },
+        // clang-format on
+    };
+    luna_state_t luna_state = {.raw = state};
+    switch (luna_state.image) {
+        case IMAGE_WALK:
+            return WALK_FRAMES[luna_state.frame];
+        case IMAGE_RUN:
+            return RUN_FRAMES[luna_state.frame];
+        case IMAGE_SNEAK:
+            return SNEAK_FRAMES[luna_state.frame];
+        case IMAGE_BARK:
+            return BARK_FRAMES[luna_state.frame];
+        default:
+            return IDLE_FRAMES[luna_state.frame];
+    }
+}
diff --git a/users/bcat/bcat_rgblight.c b/users/bcat/bcat_rgblight.c
new file mode 100644
index 0000000000..cd6222262b
--- /dev/null
+++ b/users/bcat/bcat_rgblight.c
@@ -0,0 +1,22 @@
+/* Copyright 2021 Jonathan Rascher
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+
+#include "progmem.h"
+
+/* Adjust RGB static hue ranges for shorter gradients than default. */
+const uint8_t RGBLED_GRADIENT_RANGES[] PROGMEM = {255, 127, 63, 31, 15};
diff --git a/users/bcat/compile.sh b/users/bcat/compile.sh
new file mode 100755
index 0000000000..81551f0ec0
--- /dev/null
+++ b/users/bcat/compile.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+set -o errexit -o nounset
+
+usage () {
+  printf "\
+usage: ./users/bcat/compile.sh [-c] [-j N]
+
+Compiles all keyboards for which bcat maintains keymaps.
+
+optional arguments:
+  -c                    performs a clean build
+  -j N                  runs N make tasks in parallel
+  -v                    shows verbose output
+"
+}
+
+compile () {
+    local keyboard=$1 layout=${2:-}
+    FORCE_LAYOUT="$layout" SILENT="$opt_silent" make -j "$opt_parallel" "$keyboard":bcat
+}
+
+opt_parallel=1
+opt_silent=true
+
+while getopts :chj:v opt; do
+  case $opt in
+    c) opt_clean=1 ;;
+    j) opt_parallel=$OPTARG ;;
+    v) opt_silent=false ;;
+    h) usage; exit 0 ;;
+    \?) usage >&2; exit 2 ;;
+  esac
+done
+
+if [[ -n ${opt_clean:-} ]]; then
+  SILENT="$opt_silent" make clean
+fi
+
+compile 9key
+compile ai03/polaris 60_tsangan_hhkb
+compile cannonkeys/an_c 60_tsangan_hhkb
+compile cannonkeys/instant60 60_tsangan_hhkb
+compile crkbd/rev1 split_3x6_3
+compile dz60 60_ansi_split_bs_rshift
+compile dz60 60_tsangan_hhkb
+compile eco/rev2
+compile kbdfans/kbd67/hotswap 65_ansi_blocker_split_bs
+compile keebio/bdn9/rev1
+compile keebio/quefrency/rev1
+compile lily58/rev1
diff --git a/users/bcat/config.h b/users/bcat/config.h
index 5bb93f3833..7bb5d71bae 100644
--- a/users/bcat/config.h
+++ b/users/bcat/config.h
@@ -14,6 +14,12 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+/* Enable NKRO by default. All my devices support this, and it enables me to
+ * dispense with the NK_TOGG key, thus saving firmware space by not compiling
+ * magic keycode support.
+ */
+#define FORCE_NKRO
+
 /* Wait between tap_code register and unregister to fix flaky media keys. */
 #undef TAP_CODE_DELAY
 
@@ -31,6 +37,22 @@
  */
 #define TAPPING_FORCE_HOLD
 
+#if defined(OLED_ENABLE)
+/* The built-in OLED timeout wakes the OLED screen every time the buffer is
+ * updated, even if no user activity has occurred recently. This prevents the
+ * OLED from ever turning off during a continuously running animation. To avoid
+ * this, we disable the default timeout and implement our own in
+ * oled_task_user.
+ */
+#    undef OLED_TIMEOUT
+#    define OLED_DISABLE_TIMEOUT
+
+#    if defined(SPLIT_KEYBOARD)
+/* Sync OLED on/off state between halves of split keyboards. */
+#        define SPLIT_OLED_ENABLE
+#    endif
+#endif
+
 #if defined(RGB_MATRIX_ENABLE)
 /* Turn off per-key RGB when the host goes to sleep. */
 #    define RGB_DISABLE_WHEN_USB_SUSPENDED
@@ -46,9 +68,42 @@
 #    define RGB_MATRIX_VAL_STEP 17
 #    define RGB_MATRIX_SPD_STEP 17
 
-/* Turn on additional RGB animations. */
+/* Enable specific per-key animation modes. */
+#    define ENABLE_RGB_MATRIX_ALPHAS_MODS
+#    define ENABLE_RGB_MATRIX_BAND_PINWHEEL_SAT
+#    define ENABLE_RGB_MATRIX_BAND_PINWHEEL_VAL
+#    define ENABLE_RGB_MATRIX_BAND_SAT
+#    define ENABLE_RGB_MATRIX_BAND_SPIRAL_SAT
+#    define ENABLE_RGB_MATRIX_BAND_SPIRAL_VAL
+#    define ENABLE_RGB_MATRIX_BAND_VAL
+#    define ENABLE_RGB_MATRIX_BREATHING
+#    define ENABLE_RGB_MATRIX_CYCLE_ALL
+#    define ENABLE_RGB_MATRIX_CYCLE_LEFT_RIGHT
+#    define ENABLE_RGB_MATRIX_CYCLE_OUT_IN
+#    define ENABLE_RGB_MATRIX_CYCLE_OUT_IN_DUAL
+#    define ENABLE_RGB_MATRIX_CYCLE_PINWHEEL
+#    define ENABLE_RGB_MATRIX_CYCLE_SPIRAL
+#    define ENABLE_RGB_MATRIX_CYCLE_UP_DOWN
+#    define ENABLE_RGB_MATRIX_DUAL_BEACON
+#    define ENABLE_RGB_MATRIX_GRADIENT_LEFT_RIGHT
+#    define ENABLE_RGB_MATRIX_GRADIENT_UP_DOWN
+#    define ENABLE_RGB_MATRIX_HUE_BREATHING
+#    define ENABLE_RGB_MATRIX_HUE_PENDULUM
+#    define ENABLE_RGB_MATRIX_HUE_WAVE
+#    define ENABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+#    define ENABLE_RGB_MATRIX_PIXEL_FRACTAL
+#    define ENABLE_RGB_MATRIX_PIXEL_RAIN
+#    define ENABLE_RGB_MATRIX_RAINBOW_BEACON
+#    define ENABLE_RGB_MATRIX_RAINBOW_MOVING_CHEVRON
+#    define ENABLE_RGB_MATRIX_RAINBOW_PINWHEELS
+#    define ENABLE_RGB_MATRIX_RAINDROPS
+
+/* Enable additional per-key animation modes that require a copy of the
+ * framebuffer (with accompanying storage cost).
+ */
 #    define RGB_MATRIX_FRAMEBUFFER_EFFECTS
-#    define RGB_MATRIX_KEYPRESSES
+#    define ENABLE_RGB_MATRIX_DIGITAL_RAIN
+#    define ENABLE_RGB_MATRIX_TYPING_HEATMAP
 #endif
 
 #if defined(RGBLIGHT_ENABLE)
@@ -64,8 +119,18 @@
 #    define RGBLIGHT_SAT_STEP 17
 #    define RGBLIGHT_VAL_STEP 17
 
-/* Turn on additional RGB animations. */
-#    define RGBLIGHT_ANIMATIONS
+/* Enable specific underglow animation modes. (Skip TWINKLE because it seems to
+ * be broken on ARM: https://github.com/qmk/qmk_firmware/issues/15345.)
+ */
+#    define RGBLIGHT_EFFECT_ALTERNATING
+#    define RGBLIGHT_EFFECT_BREATHING
+#    define RGBLIGHT_EFFECT_CHRISTMAS
+#    define RGBLIGHT_EFFECT_KNIGHT
+#    define RGBLIGHT_EFFECT_RAINBOW_MOOD
+#    define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+#    define RGBLIGHT_EFFECT_RGB_TEST
+#    define RGBLIGHT_EFFECT_SNAKE
+#    define RGBLIGHT_EFFECT_STATIC_GRADIENT
 #endif
 
 #if defined(BACKLIGHT_ENABLE)
@@ -77,3 +142,9 @@
 
 #    define BACKLIGHT_LEVELS 7
 #endif
+
+/* Turn off unused config options to reduce firmware size. */
+#define LAYER_STATE_8BIT
+#define NO_ACTION_ONESHOT
+#undef LOCKING_RESYNC_ENABLE
+#undef LOCKING_SUPPORT_ENABLE
diff --git a/users/bcat/readme.md b/users/bcat/readme.md
index 1922f95f4a..bb73a53bf8 100644
--- a/users/bcat/readme.md
+++ b/users/bcat/readme.md
@@ -6,6 +6,8 @@ keyboard-specific keymaps for boards without standard layout support. I derive
 my keymaps from two canonical ones (preferred for typing and gaming,
 respectively).
 
+You can build all keymaps I maintain at once using `./users/bcat/compile.sh`.
+
 ## Canonical keymaps
 
 * [Split 3x6 + 3 thumb
diff --git a/users/bcat/rules.mk b/users/bcat/rules.mk
index 12c9a89bf4..bb4bb11d88 100644
--- a/users/bcat/rules.mk
+++ b/users/bcat/rules.mk
@@ -1,7 +1,10 @@
-SRC += bcat.c
-
-# Enable Bootmagic Lite to consistently reset to bootloader and clear EEPROM.
-BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+# Enable Bootmagic Lite for keyboards that don't have an easily accessible
+# reset button, but keep it disabled for all others to reduce firmware size.
+ifneq ($(filter $(strip $(KEYBOARD)),ai03/polaris dz60 kbdfans/kbd67/hotswap),)
+	BOOTMAGIC_ENABLE = yes
+else
+	BOOTMAGIC_ENABLE = no
+endif
 
 # Enable media keys on all keyboards.
 EXTRAKEY_ENABLE = yes
@@ -16,21 +19,49 @@ NKRO_ENABLE = yes
 # Enable link-time optimization to reduce binary size.
 LTO_ENABLE = yes
 
-# Disable unused build options on all keyboards.
+# Include common utilities shared across all our keymaps.
+SRC += bcat.c
+
+# Include additional utilities that extend optional QMK features only enabled
+# on some keyboards.
+ifeq ($(strip $(OLED_ENABLE)), yes)
+	SRC += bcat_oled.c
+	WPM_ENABLE = yes  # for WPM and animated "keyboard pet" widgets
+
+	# OLED pets (animated critters that react to typing) take up a lot of
+	# firmware space, so only compile one, and only if requested.
+	BCAT_OLED_PET ?= no
+	ifneq ($(strip $(BCAT_OLED_PET)), no)
+		SRC += bcat_oled_pet_$(strip $(BCAT_OLED_PET)).c
+		OPT_DEFS += -DBCAT_OLED_PET
+	endif
+endif
+
+ifeq ($(strip $(RGBLIGHT_ENABLE)), yes)
+	SRC += bcat_rgblight.c
+endif
+
+# Disable unwanted build options on all keyboards. (Mouse keys are turned off
+# due to https://github.com/qmk/qmk_firmware/issues/8323, and the rest are
+# turned off to reduce firmware size.)
 COMMAND_ENABLE = no
 CONSOLE_ENABLE = no
 MOUSEKEY_ENABLE = no
 TERMINAL_ENABLE = no
 
-# Disable unused hardware options on all keyboards.
+# Disable unwanted hardware options on all keyboards. (Some keyboards turn
+# these features on by default even though they aren't actually required.)
 MIDI_ENABLE = no
 SLEEP_LED_ENABLE = no
 
 # Disable other unused options on all keyboards.
 AUTO_SHIFT_ENABLE = no
 COMBO_ENABLE = no
+GRAVE_ESC_ENABLE = no
 KEY_LOCK_ENABLE = no
 LEADER_ENABLE = no
+MAGIC_ENABLE = no
+SPACE_CADET_ENABLE = no
 SWAP_HANDS_ENABLE = no
 TAP_DANCE_ENABLE = no
 UCIS_ENABLE = no