Sunfish: a Python Chess Engine in 111 lines of code
simple chess game written in C
Chess program
SJCE - free portable cross-platform graphical chess game, 100% Java.
A simple 2D-Chess
A simple and free chess clock software.
A simple network chess game
Yet Another Chess ENgine
A very simple demo in order to show how to use JLightChessLib
Just aims to be a chess board (free to make your moves).