AlephOne

AlephOne is the open-source continuation of Bungie's Marathon game engine. In addition to playing the Marathon Trilogy, AlephOne also plays several third-party games built for this game engine. AlephOne features several enhancements over the original engine, including OpenGL rendering, support for high-resolution graphics and texture packs, plugins, 3D models, Lua scripting, and internet multiplayer. 
In 2005 Bungie authorized the release of the full original Marathon Trilogy for no-charge online distribution. 
I'm pleased to announce that the AlephOne game engine, as well as the Marathon Trilogy, and several third-party games are now available on the Fienix software repository.