A brave group-effort by the gentlemen at Ottawa.rb (aka OGRE), spacewar is a legitimate heir to the glory that is the original game you likely played on an xt or more ancient beast of a machine.
For the latest stable version:
sudo gem install spacewar
Or from source:
git clone git://github.com/edward/spacewar.git cd spacewar rake install
Fork the project.
Make your feature addition or bug fix.
Add tests for it. This is important so I don't break it in a future version unintentionally.
Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
Send me a pull request. Bonus points for topic branches.
Copyright © 2009 Edward Ocampo-Gooding and the OGRE people who actually wrote this. See AUTHORS and LICENSE for details.