4st Attack - 4st Attack is a game in which you have to try to out-smart your opponent.

Chess Tempo Database - Chess Tempo Database gives you a library of more than 2 million searchable chess games.

4 in a Row - 4 in a Row, the classic game that's easy to understand, but hard to master.

DecodeChess - AI chess tutor and analysis

Fial3d - FIAL3D is a console based 3D 4-in-a-row game made with ascii graphics. FIAL3D stands for Four.In.A.Line.3D.

ChessPad - ChessPad is a feature-rich chess game viewer and PGN file editor available for Windows.