18xx Game Engine
The 18xx series of board games is of great fascination to me.
However, the parts which are interesting are the human interaction; the actual physical actions (computing best paths, keeping tabs on other players and their cash) don't appeal to me.
This is a quiet experiment with implementing the rules as a daemon in Python. With some effort, I assume different front-ends will be able to hook into the Daemon, giving us much more flexibility when creating front ends for the game.