Steam:
- Aliens: Colonial Marines + Season Pass
- Arma 2
- Arma 2: British Armed Forces
- Arma 2: Operation Arrowhead
- Arma 2: Operation Arrowhead Beta
- Arma 2: Private Military Company
- Arma 3 Alpha
- Arma 3 Alpha Lite
- Arma X: Anniversary Edition
- Arma: Cold War Assault
- Arma: Gold Edition
- Brink
- Call of Duty 4: Modern Warfare
- Call of Duty: Black Ops II + Season Pass
- Call of Duty: Modern Warfare 3 + Season Pass
- Call of Duty: World at War
- Champions Online: Free For All
- Counter-Strike
- Counter-Strike: Condition Zero
- Counter-Strike: Condition Zero Deleted Scenes
- Counter-Strike: Global Offensive
- Counter-Strike: Source
- Dota 2
- Duke Nukem Forever
- Enemy Territory - QUAKE Wars(TM)
- Forsaken World
- Global Agenda
- Hard Reset
- Hydrophobia: Prophecy
- Killing Floor
- Killing Floor Mod: Defence Alliance 2
- Metro 2033
- Midnight Club II
- PAYDAY: The Heist
- PlanetSide 2
- Portal
- Quake 4
- Quake II - Ground Zero
- Ravaged
- Saints Row 2
- Spiral Knights
- Team Fortress 2
- Torchlight II
- TrackMania-2 Stadium
- Unreal Tournament 3: Black Edition
- War Inc. Battlezone
Origin:
- Battlefield 1942
- Battlefield 3 - Limited Edition + Premium
- Crysis 2 - Maximum Edition
- Crysis 3 - Hunter Edition
- Dead Space 2
- Dead Space 3 - Limited Edition + Season Pass
- Need for Speed: The Run - Limited Edition
- Need for Speed: Most Wanted - Limited Edition + all Extras
- Battlefield 4 - Digital Deluxe Edition - pre-ordered
Others:
- Firefall
- Smite
- Tribes Ascend
- Battle for Graxia
- Borderlands
- Red Faction
- Red Faction II
- Saints Row 2
- Diablo III
That are all the Games I have installed at the moment so far.