Rybka 3 with Aquarium
The new interface designed specifically for Rybka 

•  A graphical user interface (GUI) designed for Rybka
•  Takes full advantage of all Rybka features
•  A database with 4,000,000 games (on 07.08.2008)
•  Free Internet chess server access
•  On-line access to Nalimov endgame tablebases (3-6 pieces)

•  Chess Resource Server: Weekly updates, exchange data
•  Unprecedented analysis features: Infinite analysis, blunder check, game analysis, interactive deep analysis (IDeA)
•  Handicap play (Elo-level 900-3100; material handicaps)
•  Fischerandom/Chess960 support
•  State of the art chess trees (fast, powerful, compact).
•  Engine matches and tournaments.
•  Supports hundreds of chess playing engines: UCI/WinBoard
•  As well as all of this you can add engine Rybka 3 UCI to the main chess programs e.g. Fritz, ChessBase, Chess Assistant, etc.
•  Rybka 3 UCI includes versions for 32 Bit and 64 Bit processors.