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ChessDB - ChessDB - a free Chess database for Mac OS X, Windows, Linux, and UNIX - like ChessBase, but better
Lichess - The complete chess experience, play and compete in tournaments with friends others around the world.
Chess Tempo Database - Chess Tempo Database gives you a library of more than 2 million searchable chess games.
DecodeChess - AI chess tutor and analysis
ChessPad - ChessPad is a feature-rich chess game viewer and PGN file editor available for Windows.
Chess Insight - Chess Insight is a chess tutor that helps you with a number of analytical powers for judging every move in chess.