Quake II engine
Game engine
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The Quake II engine is a game engine developed by id Software for use in their 1997 first-person shooter Quake II. It is the successor to the Quake engine. Since its release, the Quake II engine has been licensed for use in several other games. Wikipedia
Programming languages: C and Assembly language
Developer(s): id Software (John Carmack, John Cash, and Brian Hook)
License: GNU GPL-2.0-or-later