Chess Tempo Database - Chess Tempo Database gives you a library of more than 2 million searchable chess games.
Scid vs. PC - Chess database and playing program.
ChessPad - ChessPad is a feature-rich chess game viewer and PGN file editor available for Windows.
DecodeChess - AI chess tutor and analysis
Scid on the go - Scid on the go app allows you to browse Scid (Shane’s Chess Information Database) files and is optimized for databases with millions of chess games.
ChessEcho - An interface to play blindfold chess, and hear the moves being played. An intuitive interface to play blindfold chess and train your focus skills, you can play against AI or real people