Arduino Pro-Micro – PrismaKBD

Programmable Macro Keyboard with an Arduino Pro Micro (32u4), Cherry Switches + Stealth Foot Pedal

Pro Micro & Fio V3 Hookup Guide - SparkFun Learn

The nice!view is a SSD1306 OLED replacement boasting >1,000x power savings while keeping a 30Hz refresh rate. It has a similar pinout to SSD1306 OLEDs

Nice!View

Pro Micro (Micro-USB) - 5V/16MHz - Arduino-compatible ATmega32U4 – Keebio

Click shield for Arduino MEGA

Click shield for Arduino MEGA

Click shield for Arduino UNO

Spice up your DIY keyboard builds with this little microcontroller, which works with the TMK and QMK firmware. It's got 18 pins for you to work with.,

Pro Micro (Micro-USB) - 5V/16MHz - Arduino-compatible ATmega32U4

Turn your ProMicro into a USB Keyboard/Mouse - SparkFun Electronics

KOOKYE 3PCS Pro Micro ATmega32U4 5V/16MHz Module Board 2 Row Pin Header for Arduino Mini Leonardo : Electronics

Programmable Macro Keyboard with an Arduino Pro Micro (32u4), Cherry Switches + Stealth Foot Pedal

Ks0249 keyestudio PRO MICRO Development Board - Keyestudio Wiki

SparkFun Pro Micro - RP2040 - DEV-18288 - SparkFun Electronics

Pro Micro – 5V/16MHz