Doom source port

This article is a list of unofficial source ports of the Doom engine, which was originally used in the video game Doom. Most often, the source ports presented here are modifications made by Doom fans, as opposed to the official Doom versions produced by id Software or affiliated companies.

The Doom engine's source code was released to the public on December 23, 1997. Although Doom was originally created for MS-DOS, the original source release was for the subsequent Linux version, due to the use of a proprietary sound library in the DOS version. The original purpose of source ports was cross-platform compatibility, but shortly after the release of the Doom source code, programmers were correcting old, unaddressed Doom bugs and deficiencies in their own source ports, and later on introducing their own modifications to enhance game features and alter gameplay.

The source code was originally released under a proprietary license that prohibited commercial use and did not require programmers to provide the source code for the modifications they released in executable form, but it was later re-released on October 3, 1999 under the GNU General Public License after requests from the community.

One of the first source ports, and one of the better known ones, GLDoom was the first attempt to bring OpenGL accelerated graphics support to the Doom engine. The project died in 1999 when its source code was lost during an accident in the developer's home.

Boom was a port for DOS of the Doom source code by TeamTNT. Boom fixed numerous software glitches and added numerous other software enhancements into the engine to such a degree that its additions have been incorporated into most modern versions of Doom source ports (such as PrBoom+, ZDoom and Doom Legacy). The last update of Boom, version 2.02, was released on October 22, 1998. In October 1999, Boom's source code was released. Further development of Boom as a source port was continued for DOS as MBF, for Windows as PrBoom, and for Linux as LxDoom. The latter two later merged as PrBoom and also took on many of the MBF features, so PrBoom's own successor, PrBoom+, is effectively the modern equivalent of Boom.

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