Wid Tech is a series of separate game engines designed and developed by id Software. Prior to the presentation of the id Tech 5-based game Rage in 2011, the engines lacked official designation and as such were simply referred to as the Doom and Quake engines, from the name of the main game series the engines had been developed for. "id Tech" numbers 1, 2, 3, and 4 have been released as free software under the GNU General Public License, along with the source code to Wolfenstein 3D, Doom, and Quake. id Tech 7 is currently the latest utilized engine.
WGoldSrc is a game engine developed by Valve, first showcased in the 1998 first-person shooter game Half-Life. Elements of GoldSrc are based on a heavily modified version of id Software's Quake engine. Following Half-Life's release, the engine powered future games developed by or with oversight from Valve, including Half-Life's expansions, Day of Defeat, and multiple games in the Counter-Strike series.
Wid Tech 3, popularly known as the Quake III Arena engine, is a game engine developed by id Software for their video game Quake III Arena. It has been adopted by numerous games. During its time, it competed with the Unreal Engine; both engines were widely licensed.
Wid Tech 4, popularly known as the Doom 3 engine, is a game engine developed by id Software and first used in the video game Doom 3. The engine was designed by John Carmack, who also created previous game engines, such as those for Doom and Quake, which are widely recognized as significant advances in the field. This OpenGL-based game engine has also been used in Quake 4, Prey, Enemy Territory: Quake Wars, Wolfenstein, and Brink.
Wid Tech 5 is a proprietary game engine developed by id Software. It follows its predecessors, id Tech 1, 2, 3 and 4, all of which have subsequently been published under the GNU General Public License. It was seen as a major advancement over id Tech 4. The engine was first demonstrated at the WWDC 2007 by John D. Carmack on an eight-core computer; however, the demo used only a single core with single-threaded OpenGL implementation running on a 512 MB 7000 class Quadro video card. id Tech 5 was first used in the video game Rage, followed by Wolfenstein: The New Order, The Evil Within and Wolfenstein: The Old Blood. It was followed up by id Tech 6.
Wid Tech 3, popularly known as the Quake III Arena engine, is a game engine developed by id Software for their video game Quake III Arena. It has been adopted by numerous games. During its time, it competed with the Unreal Engine; both engines were widely licensed.
WQfusion is a 3D game engine. The project was started by Victor Luchitz along with several others. It is written in C for use on Windows and Unix-based systems. The engine also supports the data of Quake III as maps, 3D models and shaders.
WQuArK, is a free and open-source program for developing 3D assets for a large variety of video games, mostly first-person shooters using engines similar to or based on the Quake engine by id Software. QuArK runs on Microsoft Windows.
WThe 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.