Some times I encounter some nice hardware projects like turning an old Casio watch in a smart watch, but those are rare in comparisson to pure coding projects, so maybe you know more?
I think they're not selling them anymore but everything is there for you to build one yourself: https://openpcr.org
Wow thats specific, cool example :)
https://gaggiuino.github.io is neat, and I’ve loosely followed it as a lover of good espresso for the last couple of years.
But it looks like they’ve change their stance to have the source code be closed since I last looked at it.