Sin: Wages of Sin
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Quake II engine
Quake
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Id Tech 3
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Quake engine
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Nexuiz
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List of open-source video games
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Source (game engine)
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Kingpin: Life of Crime
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Anachronox
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Ion Storm
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Daikatana
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List of file formats
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Duke Nukem Forever
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Sin (video game)
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Half-Life (video game)
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List of free and open-source software packages
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Soldier of Fortune (video game)
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QuakeC
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Quake II
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OpenGL
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Id Software
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Heretic II
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Quake 2 engine
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