|Engine||Any Boom-compatible source port|
|Release date(s)||No stable release yet (latest unstable – 0.8 beta 1, released May 12, 2012)|
Freedoom is a free first-person shooter under continuous development. Several versions exist:
- Complete IWAD, based on Doom II IWAD
- Ultimate IWAD, based on The Ultimate Doom IWAD
- FreeDM IWAD, a stand-alone Deathmatch IWAD
A Demo IWAD, based on the shareware version of Doom, also used to be available.
Freedoom was possible because id Software released the source code of the Doom engine in 1997 under the GPL license. This allows any custom levels or other customizations designed for Doom or Doom II (e.g. PWAD files) to be used with Freedoom.
As downloaded from the official Freedoom site, it is distributed as IWAD (game data) files only without an engine. The player must provide a Doom source port such as PrBoom, ZDoom, Boom, or any other Boom-compatible source port. Freedoom requires an engine with Boom extensions and will not work with the original Doom engine's source release.
It is possible, though, to use Freedoom resources on other ports, such as Doomsday Engine or Chocolate Doom, by combining it with a PWAD.