Garry's Mod (officially abbreviated to GMod) is a sandbox physics game that allows the player to manipulate objects and experiment with physics using the Source engine. Garry's Mod has been available on Steam's content delivery service since November 29, 2006. Despite being a standalone game, Garry's Mod requires the user to own at least one game on Steam based on Source engine, such as Half-Life 2, Counter-Strike: Source, or Team Fortress 2. It is also commonly used for the creation and publishing of videos on YouTube, mainly from Team Fortress 2, Half-Life 2,Portal and Left 4 Dead.
Although Garry's Mod is usually considered to be a full game, it has no game objective and players can use the game's set of tools for any purpose. Garry's Mod allows players to manipulate "props" – various objects that players can place in-game. Props can be selected from any installed Source engine game or from a community created collection. The game features two "guns" – Physics Gun and Tool Gun for manipulating objects. The Physics Gun allows objects to be picked up, adjusted and frozen in place. The Tool Gun is a multi-purpose tool for performing various tasks, such as combining props, attaching them via ropes, and creating controllable winches and wheels. The Tool Gun is also used to control add-ons created by the community.
Some Screenshot :
MW2 and MOH 2010