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Browser Based
Servers, British Chess Magazine - The Chess Shop, BrowserChess, Chess Board, Chess Fans, Chess Hounds, Chess Lab, Chess Mail, Chess Stop, Chess World, Chess.net
Competitions
Lyapko George's WinBoard related page, SSDF rating list, WBEC Ridderkerk
Freeware
Arasan, BabyChess, Dalek Chess, E.T. Chess, Egg Chess, Free Chess, Hotbabe Chess, Maniac, NagaSkaki, RDCHESS
HIARCS
HIARCS: PC, Mac & Palm PDA Chess Software
Linux
Cheops, KChess Elite, KingShine OpenGL Chess Board, Pythonchess
Macintosh
Databases, For Organizers, Multiplayer, Publishing, Reviews and Previews, Tutorial Software, Chess Deluxe, Chessmaster 9000 Mac, Crafty 14.11B, Crafty Mac 18.08 text, GNUChess 4.0b5, HIARCS 7.0, HIARCS 9.6, j2chess, MacChess, MacChess - chess on Mac
Multiplayer
Eboard, ICC Interfaces, JavaBoard for FICS, Knights Chess Interface
PDA
PalmOS, PocketPC, Chess Programs for Palm OS and Pocket PC, Helio ChessMate, Little Monsters, Mobile Chess games by VEL Technologies, PocketChess 1.0 for Royal DaVinci, PocketChess 1.2a for Epoch
Programming
14.3 Computer Chess, Aristarch, Chess Brain - Programming Theory, Chess Tree Search, Chessopolis: Computer Chess, ChessPatterns.com, Computer chess / GNU chess, chess programming, Computer Chess Programming, Computer Chess Programming, GameDev.net -- Chess Programming Part I: Getting S
Shareware
ChessPartner, Interchess
Windows
Chess Commander, Chess Mentor, Chessmaster, Crafty, EXchess, GNUChess, Gromit, Multiplayer, Rebel, Winboard and Xboard
Full ZX-81 Chess in 1K
Describes a 672 bytes program that plays chess.
Kuro5hin
Assembly program by David Horne, which is run on the ZX81 with just 1k of memory.