QMK (Quantum Mechanical Keyboard) is a community-maintained open source software, including QMK firmware, QMK toolbox, qmk.fm website, and related documents.

The QMK firmware is a tmk_keyboard The keyboard firmware, which implements some useful functions in Atmel AVR microcontrollers.to be precise, inOLKB product lineexist ErgoDox EZ keyboard, and Clueboard product line superior.

It is ported to an ARM chip using ChibiOS and can function in a flying-wire keyboard or a custom PCB keyboard.