Company: Valve

Half-Life
Portal
Left 4 Dead
Left 4 Dead 2
Prospero
Half-Life 2: Episode One
Half-Life: Blue Shift
Team Fortress 2
Portal 2
Team Fortress Classic
Half-Life 2
Counter-Strike: Source
Half-Life
Counter-Strike: Global Offensive
Half-Life: Opposing Force
Counter-Strike
Dota 2
Half-Life: Decay
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Team Fortress, Day of Defeat, Counter-Strike and Ricochet were all originally fan-made mods.
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Development, General
person Zlew calendar_month September 24, 2013
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