Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Cubelands - Cubelands is an Exciting, Role-playing, Sandbox, Building, Single and Multiplayer video game created and published by Upjers.
Rage - Rage Software, also Rage Games and FX Digital Network, was a British video game developer.
Garry’s Mod - Garry’s Mod is Funny, Sandbox, Co-op, Building, FPS, Action, Single and Multiplayer video game created by Facepunch and published by Valve.