Aleph One (formerly known as the Marathon Open Source Project) is a free and open-source first-person shooter engine based on the source code of Bungie Studios' Marathon 2: Durandal. The project commenced in early 2000, when Bungie released the code shortly before being acquired by Microsoft and spurred the fan community to further develop it. Since that time, Aleph One has become a successful project in terms of development and community support. Most modern-day and die-hard Marathon enthusiasts use Aleph One due to its enhancements over the original games and the fact that it is playable with today's platforms. Its name is taken from the second infinite cardinal number in transfinite arithmetic and references Marathon Infinity, the final game in the Marathon Trilogy.

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Aleph One 0.23

5 years ago News 4 comments

"Major highlights for this release include an entirely new modern 3D renderer option, a plugins system, PNG screenshots, Lua API improvements, and bug fixes. You can read the complete release notes here:"
-Treellama; Aleph One developer

The one big thing about this release is that OS X 10.4 is now a requirement, not the predicted 10.3.9, it's 10.4 or stick to 0.22.
Some net games will be compatible between 0.23 and 0.22, rugby is not though and maps with the new lua functions obviously won't work.

Here's some images of the shaders in-game (Note the corrected perspective)

What are you waiting for? Download the new build!

Aleph One 0.22 [09 Sep 2009]

Aleph One 0.22 [09 Sep 2009]

6 years ago News 0 comments

Aleph One 0.22 is available Highlights for this release include Lua persistence, a network stats display, and joystick support (from Eric Peterson). Jeremiah...

Aleph One 0.21.2 [26 Dec 2008]

Aleph One 0.21.2 [26 Dec 2008]

7 years ago News 0 comments

* Added support for custom window sizes (by editing prefs file) * Fixed assertion failures when changing levels in net games * Restore the previously...

Aleph One 0.21.1 [17 Dec 2008]

Aleph One 0.21.1 [17 Dec 2008]

7 years ago News 0 comments

A bug fix release * Ensure Lua scripts work on all platforms * Work around a weird Windows crash when metaserver login is denied * Fix crashes when gathering...

Add game Games


1 year ago Released 1994 First Person Shooter

You are a security guard who accompanied a group of space colonists on their trip on the huge space ship, the Marathon. Suddenly, aliens who call themselves...

Marathon 2: Durandal

Marathon 2: Durandal

1 year ago Released 1995 First Person Shooter

Marathon 2: Durandal was the first sequel in the Marathon series of science fiction first-person shooter computer games from Bungie Software. It was released...

Marathon Infinity

Marathon Infinity

1 year ago Released 1996 First Person Shooter

The third title of the three games collectively known as the Marathon Trilogy, you reprise your role as a security officer, you must rewrite time to stop...

Post comment Comments
fier_ Jun 15 2010 says:

Xilef, you forgot .23.2

+1 vote     reply to comment
Wolf633 Oct 13 2009 says:

yes, a good old game like game. makes fun!

+1 vote     reply to comment
leilei Sep 26 2009 says:

It is not public domain.

+1 vote     reply to comment
xilefian Sep 26 2009 replied:

It's GPL, I am wondering why it says that.
How can you edit it out?

+1 vote     reply to comment
micom1318 Jun 19 2009 says:

I love this game and I love halo :P

+1 vote     reply to comment
Darklord42 Nov 21 2008 says:

Haha finally. Despite being a really old, this game is a lot of fun, and has a way of drawing people in for long periods of time. Really, try this on the internet. It's a real blast.

+1 vote     reply to comment
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Released 2000
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