Chess Tempo Database - Chess Tempo Database gives you a library of more than 2 million searchable chess games.
Lichess - The complete chess experience, play and compete in tournaments with friends others around the world.
DecodeChess - AI chess tutor and analysis
Chess.com - Play chess on Chess.
Scid vs. PC - Chess database and playing program.
Chessmaster - Chessmaster is a chess playing computer game series which is now owned and developed by Ubisoft.