https://github.com/icebreaker-fpga/icebreaker
iCE40UP5K
interesting ice40 projects:
https://github.com/smunaut/iua
https://youtu.be/JjU5OQCWgms
part 1: https://youtu.be/4-JE2nZt0sk
part 2: https://youtu.be/UD2h8IuLXCQ
https://github.com/smunaut/ice40-playground/tree/master/projects/usb_audio