Rf6.com

Chess Instructions for Beginners
Appropriate for those seeking to learn to play chess.
www.intuitor.com/

Tandem Chess and Bughouse
Bughouse rules and strategy, as well as information about playing by email.
www.chessvariants.com/

Computer chess / GNU chess, chess programming
GNUChess programming with GNU versions for Atari, Mac, Windows, Unix. Also contains other games that are using chess programming techniques. Java, C, C++ source code included for all games.
users.telenet.be/

Giveaway Chess
Extensive information about rules of giveaway chess as well as rule variants and links.
www.chessvariants.com/

Laws of Bughouse Chess
Official bughouse laws, ratified by the World Bughouse Network.
mujweb.atlas.cz/

Chess Commander
Provides trial downloads, screenshots, and purchasing information.
www.chesscommander.com/

Chess Geek.com
Solve online puzzles.
members.aol.com/

Chess Mentor
Includes support, a demo, and purchasing information.
www.chess.com/

Wikipedia - Chess boxing
Hyperlinked encyclopedia article about the hybrid sport combing chess and boxing.
en.wikipedia.org/

Bughouse Chess
Bughouse in java, for beginners.
www.pathguy.com/