Source Engine

Half-Life: Source
Half-Life Deathmatch: Source
Half-Life 2
Half-Life 2: Lost Coast
Half-Life 2: Episode One
Half-Life 2: Episode Two
Half-Life 2: Deathmatch
Portal
Counter-Strike: Source
Day of Defeat: Source
Team Fortress 2
Dark Messiah Might and Magic
SiN Episodes Emergence
Vampire: The Masquerade - Bloodlines
The Ship

Coming Soon...
Left 4 Dead
Half-Life 2: Episode Three
Postal 3

& Many other mods...