I was actually lucky to have gotten a FOMU from mithro years ago at a hacker event. It was really fun to play around with micropython on the RISC-V softcore [0]!
Thanks to RE the entire toolchain (formerly yosys) is open source for the lattice ICE40 [1] and they continue to add more fpga bitstreams like the ECP5.
If anyone is looking for a cheap (~$15) and larger fpga board to tinker with, look no further than the ColorLight 5A-75b [2]
[0] https://github.com/im-tomu/fomu-workshop/blob/master/docs/ri...
[2] https://hackaday.com/2020/01/24/new-part-day-led-driver-is-f...
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