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.
ChessPad - ChessPad is a feature-rich chess game viewer and PGN file editor available for Windows.
Fritz - Fritz is the world’s most popular chess program, developed by ChessBase, “the world's leading...