Nemesis Checkers:Nemesis plays English/American checkers. It is the current computer checkers world champion.
Buggy: Buggy is an international draughts (10x10, flying kings) program for windows. It is probably the strongest program for this checkers variant. Site available both in French and in English.
Checkers Games by Atlant Software: Game of checkers played against the PC. The programs contain self-learning algorithm of game and friendly interface.
World Championship Checkers: English/American checkers program for windows.
Wyllie Checkers Program: English/American checkers program for windows, includes a large historic games archive.