id Software
Gearbox Software
Electronic Arts
Epic Games
Microsoft
Turtle Rock Studios
Campo Santo (company)
Activision Blizzard
Bethesda Softworks
Xbox Game Studios
Riot Games
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Naughty Dog
ZeniMax Media
American video game development and digital distribution company
valvesoftware.com
Valve Corporation, also known as Valve Software, is an American video game developer, publisher, and digital distribution company headquartered in Bellevue, Washington. Wikipedia