Current Joker version is joker-2.0.tar.gz
Joker is an Othello(TM) program, done in 1989-90. The program is not very strong, but it has a nice user interface consisting of a ray traced board.
The size of the original board is 1024 x 750 pixels, this image is 1/4 of the original size, with the optional X shape extension:
You can compile it if you have the XView library.
This program was done by Holger Joist, Jürgen Weigert, Michael Schröder and me.