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.
Chess.com - Play chess on Chess.
DecodeChess - AI chess tutor and analysis
Chessmaster - Chessmaster is a chess playing computer game series which is now owned and developed by Ubisoft.
ChessPad - ChessPad is a feature-rich chess game viewer and PGN file editor available for Windows.