Since Doomsday 1.8.5, the Doomsday engine expanded onto Linux and Mac. Daniel Swanson (DaniJ) joins the Doomsday effort on August 14, 2003.

On MaDoomsday 1.7.8 is released, Graham Jackson forks his Boomsday project based on this version.

jHeretic and jHexen remained under the terms of Raven Software's non-profit End User License Agreement. The Doomsday engine and jDoom were relicensed to GNU General Public License (Version 2) on March 3, 2003. Though the plugins are not required for the Doomsday engine to function and additional plugins can be added. The jports were each consolidated into plugins that relied on the Doomsday engine to function. The Doomsday engine was a central engine, created by Skyjake that contains much of the common code used by his three separate jports. The exact date of the first release of the Doomsday engine (1.0.0) is unknown or simply forgotten.

Within a year Skyjake created similar ports for Heretic (March 20, 2000) and Doom (May 31, 2000), known as jHeretic and jDoom respectivly. At this point jHexen is already an OpenGL hardware accelerated port with numerous visual enhancements. On November 1st 1999 Jaakko Keränen (skyjake), released the first version of his Hexen source port: jHexen 0.97.1.

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