Source
Game engine
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Source is a 3D game engine developed by Valve. It debuted as the successor to GoldSrc in 2004 with the releases of Half-Life: Source, Counter-Strike: Source, and Half-Life 2. Wikipedia
Programming language: C++
Initial release date: October 2004
Creator: Valve
License: Proprietary
Middleware: Havok
Predecessor: GoldSrc