Core Wars is a competitive artificial life game based on the threaded shared-memory self-modifying assembly language Red Code.
- http://nmars.sourceforge.net/ -- MARS on .Net and Mono
- http://www.koth.org/ -- King Of The Hill & pmars
- http://www.corewars.org/ -- also has good links
- Beginners' guide to redcode
-- Ian Holmes - 23 Apr 2007