Freedoom is an innovative project designed for users of the free and open source Doom engine, providing a rich array of content for players. It features three IWAD files, including two single-player campaigns, Freedoom: Phase 1 and Phase 2, as well as FreeDM, which focuses on multiplayer deathmatch levels. This versatile game enhances the classic Doom experience by offering additional gameplay options and environments.

The Freedoom project complements the original Doom engine's open-source code, licensed under the GNU GPL since its release inIts content is available under a permissive 3-clause BSD license, allowing for extensive customization. Players can create and utilize custom levels and modifications (PWAD files) tailored for Doom, Doom II, or Final Doom, making Freedoom a valuable resource for both new and veteran fans of the genre.