Marathon open source 20111201 - Windows free game

Author: Aleph One

Alien forces have boarded the interstellar colony ship Marathon. The situation is dire. As a security officer onboard, it is your duty to defend the ship and its crew.

Experience the start of Bungie's iconic trilogy with Marathon. This release is a meticulous conversion of the original game to the Aleph One engine, with many details and battles restored that were missing from the earlier "M1A1" release.