DOSDoom

DOSDoom is the first Doom source port, as well as the first DOS port of Doom after the release of the Doom source code. The initial versions were developed by Chi Hoang, and later ones were by a small team of other developers. DOSDoom became the basis for a number of other source ports, including Boom, Doom Legacy, and EDGE.

Chi Hoang released the initial version of DOSDoom on December 23, 1997, shortly after the Doom source code came out. According to Hoang, "it took me 4-5 hours to port". Later versions of the source port added various new features including free look, translucency, jumping, and DDF scripting. The final version of DOSDoom, 0.653, was released on April 10, 1999.