Tow Bowl Tactics is a game based on Games Workshop's Blood Bowl. It is an epic conflict between two teams of heavily-armed and quite insane warriors. Players pass, throw, or run with the ball, attempting to get it to the End Zone at the end of the field to score a touchdown. Games are full of violence and carnage and could be compared to a combination of Warhammer, American football, and rugby.
Universe is an Open-Source game which resembles Master Of Orion. It is written in Java. The goal is to have as few arbitrary limits as possible, allowing games as large as you wish. It also supports a concept called "Schemes" which allows programmers to develop distinct rule sets and extensions.
Metal Mech is a Web-based mass multiplayer game of battle between robots and space exploration. It is a game of strategy, economics, role-playing, and combat. Each player can handle their own war robot and battle against other players to be the emperor of the universe. Players battle against each other for resources, energy, money, buildings, and more. They can build mines and buildings and produce robots, weapons, devices, etc. Players can also trade with each other.
Morris is an implementation of Nine Men's Morris that also supports several rule-variants and different board layouts (including Morabaraba). You can play against the computer, or play against another human opponent. The computer opponent learns from previous games and tries not to make the same mistake twice. This ensures continuous variation in game play, should you manage to beat the program. Furthermore, the program can give move hints and provides unlimited undo/redo.