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.
Chess for mobile OS Android, it is possible to play online on FICS, tha largest chess server, or offline against a chess engine with difficulty setting.
Lords of Doom is a software game still in development.
It's a turn-based strategy game, that can be played alone (against AI) or against other through a network (local or internet).