Gomoku - Online Game Hall - This is the most powerful gomoku game on Mac App Store. For the game rule:
Jin - Jin is an open source, cross platform, graphical client for chess servers, written in Java.
4 in a Row - 4 in a Row, the classic game that's easy to understand, but hard to master.
Pure Chess - A beautiful and engaging multiplayer chess experience.
Lichess - The complete chess experience, play and compete in tournaments with friends others around the world.
Fial3d - FIAL3D is a console based 3D 4-in-a-row game made with ascii graphics. FIAL3D stands for Four.In.A.Line.3D.