Soccar is Soccer with Cars. It uses realistic physics and cool 3D graphics. Try it alone first, and then later with friends over the internet or on LAN.
Ultimate Basketball Challenge is a 5 on 5 basketball game for linux. It currently includes a basic ai, basic passing support, the ability to shoot the ball and to have it blocked.
Airtraffic is a game/simulator that puts you into an air traffic controller's hotseat. Planes come into your airspace from various directions and you have to guide them safely to their destinations. It uses Python, Corba, and GTK.
carterrain is a 3D multi-player splitscreen, offroad racing game. Race against a bunch of friends crowded around a keyboard.
carterrain's features:
A Killer offroad course
Accurate, car physics
Race against up to 6 friends on the same pc