Tools
Both official and unofficial tools that can make working with QMK easier.
QMK Configurator
Awesome tool for anybody who does not need advanced funtionality, just an easy way to work on keymaps.
kbfirmware.com -> mainline QMK converter
https://noroadsleft.github.io/kbf_qmk_converter
Behind the scenes, kbfirmware.com uses an ancient fork of QMK (3+ years old, afaik).
Tries to bring the code generated by kbfirmware.com up to standards.
It’s a great starting point to add support for boards that has kbfirmware json but not supported by mainline QMK.
VID/PID usage info
https://yanfali.github.io/qmk_usb_usage
Vendor and product IDs become a topic of conversation with VIA, since it uses these two values to indentify a board.
Pulls the usage data from the QMK API and allows filtering.
Useful for those thinking about adding VIA support for their boards.
Helix font editor
https://helixfonteditor.netlify.app
Allows you to upload a glcdfont.c file, edit it and save it back to C file. Useful for OLED-lovers.
Logo editor
Another useful tool for users of OLED screens.
Combo generator
https://codepen.io/mvaneijgen/full/LYEVQXp
Handy tool for generating Combos.