Suggest an alternative to

STeMCell

STM32F4 breakout board in pro micro pinout. Designed mainly for ergo split keyboards.

Why do you think that https://github.com/zmkfirmware/zmk is a good alternative to STeMCell

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with STeMCell. Optional.

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