Chess Tempo Database - Chess Tempo Database gives you a library of more than 2 million searchable chess games.
Lucas Chess - The aim is to play chess against the computer with increasing levels of difficulty and with a...
Scid vs. PC - Chess database and playing program.
Lichess - The complete chess experience, play and compete in tournaments with friends others around the world.
ChessPad - ChessPad is a feature-rich chess game viewer and PGN file editor available for Windows.
Tarrasch Chess GUI - Tarrasch is a flexible, minimalist, and easy to use chess GUI.