Garry's Mod: Source (Game Engine), Mod (Computer Gaming), Game Engine, Puzzle Video Game, Nonlinear Gameplay, Role Playing SDK, Half Life 2

Jailbreak Source: Multiplayer Video Game, First Person Shooter, Mod (Computer Gaming), Valve...

Dystopia (Video Game): First-Person Shooter, Video Game, Mod (Computer Gaming), Valve Corporation,...

Darklands (video game): Role-playing game, MicroProse, Personal computer, DOS, Holy Roman Empire,...

Iron Storm (video game): First-person shooter, Mod gaming), Valve Corporation, Source (game...