MegaMek is an unofficial, online version of the Classic BattleTech board game.

Currently, nearly all Total Warfare BattleTech rules and technology are working. Work is progressing on Tactical Operations rules and technology, and many of those are functional at this point. Aerospace rules are also included, with the exception of ground/air interaction.

MegaMek is open source, free software. It is licenced under the GPL.

For more information, check out the links to the left. Bug reports or feature requests may be submitted to the MegaMek project page. For help, or just to chat, there are forums available on the project page, and on the MegaMekNET site.