Some unsorted links : WEBC : Simply the best source in computer chess. By Leo Dijksman Chess War : Chess engines tourneys by Olivier Deville Dirty Dozen :  Chess engines tourneys by Fonzy Winboard tournaments : By George Lyapko RWBC : by Günter Simon Arena : GUI (graphical front-end) WinboardX : GUI by Alessandro Scotti Computer Chess Club Forum CCRL : Group of engine testers Homer : A must have engine by Daniel Mehrmann Andrew Fan Site : Firefly engine, and some clients to connect to live broadcasts Pradu Kannan web site : Buzz chess engine and PSWTM tourney manager Tom's chess utilities : Broadcasts server and client. Kanguruh chess engine