Reversi (also known as Othello), is a board game for two players, played on a grid of 64 squares. A minute to learn, a lifetime to master!
Play Reversi/Othello Online
Artifact Interactive Reversi
Artifact Interactive provides a number of Flash games that can be played online. Their Reversi game is simple but classic. [Flash]
GameKnot is primarily a Chess site, but it also offers this slick game of Reversi. [Java]
GoldToken allows you to play turn-based games and make new friends from around the world. With over 200 classic board games and variations to choose from, there will never be a dull moment! GoldToken's environment is suitable and safe for all ages.
Play free online games including Backgammon, Battleboats (Battleship), Chess, Checkers, Othello, Pente, and more - over 35 different games and variations. No Java, no downloads. Tournaments and extensive message boards are part of this active community.
Play Othello (or Reversi) across the Internet. Allows your other friends to view game in progress using special spectator mode. Chat with your friends real-time. Allows off-line playing with human or computer player too.
PlayOK offers free online games that you can play right from your browser, with no download required. [Java]
At YourTurnMyTurn.com you can play turn-based classic online board games and modern board games against other players. Your opponent doesn't have to be online. Requires free registration.