I've finished writing Connect4 for IRC, didn't take very long, you can play by typing:

/msg U startgame connect4

I've uploaded the source code, it looks much larger than it is, mostly due to the boring code to see if you've won, and the pretty colours with the board.

I'll happily run other games, the API is really really simple and supports from 1 to unlimited players, it does all the lobby work for you.