Thor

Thor is a strangely named Othello program. You can play against the PC or against another human opponent sharing the same keyboard / mouse. The PC opponent is supposed to be extremely good, and the program is recommended by the "French Othello Federation". The controls take a little getting used to, but I found it's easiest to use the mouse and click the piece you want to move, then where you want to move it. Overall if you want a no-frills version of Othello to play, especially against a decent AI opponent, this would be a good choice.