Spacewar

Alex Nicolaou's Space War
Contains Java based version of game, with instructions.
http://www.cgl.uwaterloo.ca/~anicolao/sw/Spacewar/spacewar.html

Spacewar
Contains history, articles covering early development, Intergalactic Spacewar Olympics, code, influences, and game controllers, and Macintosh version of game.
http://www.wheels.org/spacewar/

SpaceWars
Peter Hirschberg and Josh Cogliati's C++ based version of game. Includes features, download of source, requirements, and screen shots.
http://www.digisys.net/users/cogs/spacewar.htm