Aleph One is the open source continuation of Bungie's Marathon 2 game engine. Available for Mac OS X, Windows, and Linux, Aleph One supports Marathon 2 and Marathon Infinity natively, and Marathon through a fan-made conversion. Many third party scenarios and net maps are also available.
Aleph One is available under the terms of the GNU General Public License (GPL).
News: Read our 1.0 announcement press release here, and full release notes here
The Aleph One game engine powers dozens of community-made games, from new levels to total conversions. Experience new weapons, monsters, and storylines set inside and outside the Marathon universe. Check out some of the most popular scenarios, and download the Aleph One engine to play them.