Source

Source is a 3D video game engine developed by Valve Corporation. Source engine envolved from SourceGold, based on heavy modified Quake 1 engine.

Fistful of Frags

19 May 2014
Fistful of Frags is multiplayer mod for Source engine, based on Wild West setting
Gamers: 2
Rating: 7
Popularity: 23

Portal 2

by Valve
Steam only
Portal 2 draws from the award-winning formula of innovative gameplay, story, and music that earned the original Portal over 70 industry...
Gamers: 9
Rating: 9.3
Popularity: 0

Left 4 Dead 2

by Valve
Steam 4 Jul 2013
Set in the zombie apocalypse, Left 4 Dead 2 (L4D2) is the highly anticipated sequel to the award-winning Left 4 Dead, the #1 co-op game of 2008.
Gamers: 11
Rating: 8.4
Popularity: 0

Half-Life 2

by Valve
Steam only
By taking the suspense, challenge and visceral charge of the original, and adding startling new realism and responsiveness, Half-Life...
Gamers: 16
Rating: 7.9
Popularity: 0

Portal

by Valve
Steam 25 Jun 2013
Portal is a new single player game from Valve.
Gamers: 15
Rating: 8.9
Popularity: 0

Team Fortress 2

by Valve
Steam only
Team Fortress 2 (TF2) is the sequel to the game that put class-based, multiplayer team warfare on the map.
Gamers: 9
Rating: 6.3
Popularity: 0