In what we can only assume to be a charitable act made in the spirit of the holidays, the Aleph One engine, which powers Marathon 2: Durandal, Marathon Infinity and a fan remake of the original Marathon, is now available to download (alongside the aforementioned games) for free. The distribution of the engine -- assumedly approved by Bungie, who just shared it through the studio's Twitter account -- is made possible thanks to its GNU General Public License.

All three games are available for PC, Mac and Linux -- as well as the iPad, thanks to an open-source project completed this past summer -- so there's really no reason for you not to check them out. Unless, of course, you can only find satisfaction through thoroughly illegal piracy. We can role-play, if that makes it any easier. "No! Don't download all those games for free! That's illegal, you bad, bad buccaneer."

Update: As many of you have pointed out, this project has been around for some time -- today just marks the arrival of version 1.0. We apologize for being so very, very late to the party.

This article was originally published on Joystiq.