Company: Valve
Prospero
Left 4 Dead
Garry's Mod
Half-Life: Decay
Portal 2
Half-Life
Left 4 Dead 2
Counter-Strike
Half-Life: Blue Shift
Counter-Strike: Source
Half-Life
Half-Life 2
Counter-Strike: Global Offensive
Team Fortress 2
Team Fortress Classic
Half-Life 2: Episode One
Dota 2
Half-Life: Opposing Force
Portal
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Team Fortress, Day of Defeat, Counter-Strike and Ricochet were all originally fan-made mods.
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