id Tech 2
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id Tech 2
Developer(s)
id Software
Release date(s)
21 December 1999 (Source code release)
Platform(s)
License
Todo: Mention 
FTE, a notable fork of the Quake I engine in relation to Valve's engines. See Quake#Source ports for more info.
FTE, a notable fork of the Quake I engine in relation to Valve's engines. See Quake#Source ports for more info.
This page documents information about an engine not developed by Valve. This information is documented here because it has technical and/or historical relevance to Valve's engines.
id Tech 2, also known as the Quake engine, is an engine created by id Software for Quake, and later modified with new features & improvements for 
Quake II. It was used as the foundation for GoldSrc and all subsequent 
Valve engines.
id Tech 2 consists of the following two "branches":
- The Quake Engine, developed for Quake and used by several other games
- The Quake II Engine (colloquially id Tech 2.5), developed for Quake II and used by several other games
Both version of id Tech 2 engines were later made open-source under the GNU GPL 2.0 (or later) license.