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| Developer(s) | Valve |
|---|---|
| Initial release | October 2004 |
| Written in | C++ |
| Middleware | Havok |
| Engine |
|
| Predecessor | GoldSrc |
| Successor | Source 2 |
| License | Proprietary |
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. Other notable third-party games using Source include Vampire: The Masquerade – Bloodlines, Dear Esther, and The Stanley Parable. Valve released incremental updates to the engine during its lifetime. In the late 2010s, Valve created the Source 2 engine to replace Source, with it publicly debuting alongside Half-Life: Alyx.