I learned about Nomic games a few days ago, so made one to help new developers learn the basics of Github pull request workflows so they can contribute to open source projects. It's aimed particularly at the freeCodeCamp community, but all are welcome. Even if you are a seasoned Github contributor, you are welcome to play, too, because Nomic is an extremely fun game!
A nomic I started with some friends. We've only gotten through eight turns, so it's still fairly close to the original ruleset. Runs on phpBB 3.