GNU ACM is a distributed aerial combat simulator that runs on the X Window System. Players can engage in simultaneous air combat from different computers. Players fly jet aircraft (something close to either an F-16C Falcon or a MiG-29 Fulcrum) equipped with radar, heat seeking missiles and cannon.

GNU ACM is a slighty modified version of the original ACM made by Riley Rainey at WebSimulations.


Source releases can be found on the main GNU server (HTTPS,   HTTP,   FTP) and its mirrors; please use a mirror if possible.


Documentation for ACM is available online, as is documentation for most GNU software. You may also find information about ACM by running info acm or man acm.

Mailing lists

ACM has two mailing lists:

Announcements about ACM and most other GNU software are made on the info-gnu mailing list.

Getting involved

Development of ACM, and GNU in general, is a volunteer effort, and you can contribute. For information, please read How to help GNU. If you'd like to get involved, it's a good idea to join the discussion mailing list (see above).

For development sources, bug and patch trackers, and other information, please see the ACM project page at

ACM is currently maintained by Sergio Lopez. Please use the mailing lists for contact.


ACM is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.