Chess engines:
Arasan
http://www.arasanchess.org/
Crafty
http://www.craftychess.com/
Critter
http://www.vlasak.biz/critter/
Toga II
http://www.superchessengine.com/toga_ii.htm
Glaurung
http://www.glaurungchess.com/
Ivanhoe
http://www.chesslogik.com/ivanhoe.htm
Komodo
http://komodochess.com/
Protector
http://sourceforge.net/projects/protector/
Redqueen
http://redqueenchess.sourceforge.net/
Robbolito
http://www.chesslogik.com/robbolito.htm
Spike
http://spike.lazypics.de/index_en.html
Stockfish
http://stockfishchess.org/
Chess engines rating lists:
http://www.computerchess.org.uk/ccrl/4040/
http://www.tcec-chess.net/engine_ratings.php
http://www.husvankempen.de/nunn/40_4_Ra ... liste.html
http://ssdf.bosjo.net/list.htm
http://chessprogramming.wikispaces.com/ ... ting+Lists
http://dotpups.de/puppy5/racy/games/
You can use the engines with
Scid vs PC http://murga-linux.com/puppy/viewtopic.php?t=85991
or ChessX http://www.murga-linux.com/puppy/viewtopic.php?t=88773
