Hedgewars - Hedgewars is a Free to play, Single-player and Turn-based Strategy video game developed by Hedgewars Development Team.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Counter-Strike 2D - Top-Down Multiplayer Shooter
Quake - Quake is a series of first-person shooter video games released by id Software.
Ironfell - Ironfell is a time travel themed massive multi-player online real time strategy game.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.