Phalanx is a chess playing engine with agresive playing style. It does not have its own graphical interface, but can be used with general chess interface Xboard (Winboard) by Timm Mann. There is also a commercial version that runs as a native Fritz module and thus can be used with the Fritz graphical interface.
Netrek is a 16-player two-dimensional graphical real-time battle simulation with a Star Trek theme. A game is divided into two teams of 8 players (or fewer), who dogfight each other and attempt to conquer each other's planets.
One of the best space simulation is available also in a Linux version.
Thirty-two years have passed since the Great war. Terrans and Vasudans have formed a new alliance. But new threats are lurking around.
Tuxánci are czechoslovak multiplatform action game. In the begining it was inspired by czech game Bulánci (which is however only for MS Windows), but now it goes its own way. The game is programmed in language C and the rendering core is based on SDL library. Man can play two-players game on one computer or in network multiplayer.