Wormux, is an open source game that has open source project characters trying to kill each other by means of shooting, explosions, and many other ingenious ways to kill something.
This game has some nice new features such as water that actually moves, the explosions are heard at the time of the explosion and the graphics look nicer.
Over all Wormux has become the new war game which I find is fun to play.
To download go to http://wormux.org and download this game for your version.