There's also inferno, which is more or less a full unix-like that can run on the pico ( https://news.ycombinator.com/item?id=37393993 https://news.ycombinator.c

There's also inferno, which is more or less a full unix-like that can run on the pico ( https://news.ycombinator.com/item?id=37393993 https://news.ycombinator.com/item?id=37393993 ) and on the Teensy and some other microcontrollers ( https://dboddie.gitlab.io/inferno-diary/index.html https://dboddie.gitlab.io/inferno-diary/index.html )