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Rating ELO: 2200 
Parrot chess engine can be seen very often on the Free Internet Chess Server playing all sort of games from bullet to classical time control. It's average rating on FICS is ~ 2300.
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Rating ELO: 2630 Crafty is a chess program written by UAB professor Dr. Robert Hyatt. It is directly derived from Cray Blitz, winner of the 1983 and 1986 World Computer Chess Championships. Website
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Rating ELO: 2687 Zappa is a chess engine, or a program that plays chess. It is similar to Deep Blue - only much better - and is best known for its good parallel speedup and dead sexy author. It has competed in many computer chess tournaments with its best result coming at the World Computer Chess Championship in 2005, where it took first place with the score of 10.5 / 11. Like Fritz or Shredder, it is a standard chess engine, which in technical terms means it is a brute force alpha-beta searcher with a heuristical evaluation. Website
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