Quake II engine
id Tech 2, originally known as the Quake II engine, is a game engine developed by id Software for use in their 1997 first-person shooter Quake II. Like its predecessor, the Quake engine, the Quake II engine was also licensed to other developers, appearing in several other games of the era, before being made freely available under the terms of the GNU General Public License on December 22, 2001. == Engine features == One of the engine's most notable features was out-of-the-box support for hardware-accelerated graphics, specifically OpenGL, along with the traditional software renderer.