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