Entris is a Tetris variant including quacking duck attacks.
Playing online with up to 5 players in one game is possible. The game server is installed at Google App Engine.
Astral Networking Astral networking is a high level multiplayer programming library. It can use PodSixNet or Mastermind for messaging. It's focus is on solid multiplayer algorithms to help set up realtime multiplayer games without any fuss.