Open Source FPS Game Software

• Cube  - Presents a multiplayer first person shooter game with satisfying fast old school gameplay. Includes a variety of original maps to play on.
• Cube 2: Sauerbraten  - Presents the conduct of map and geometry editing dynamically in-game. Also creates fun gameplay and an elegant engine.
• Doomsday  - Creates versions of Doom, Heretic and Hexen similar to the original games. With a forum that discusses about the Doomsday Engine.
• Freedoom  - Creates a complete Doom-based game which is Free Software. Also includes the site's updates.
• PrBoom  - Presents a brief background of PrBoom. With details on the culmination of the work by various people and projects on the Doom source code.