Browser Based

Ajax - Java othello applet with a friendly interface and a very strong engine.

GameSite 2000 Reversi - Online reversi with chat, customizable graphic interface, and play against live or internet opponents.

Interjeux - Othello/Reversi - An online playing version of the Othello/Reversi game.

Java Othello Openings - Large catalog of othello openings, viewable in a java applet.

Kelly's JavaScript Othello Game - Variant with game play options including one, two, and no player games.

Kurnik - Offers real-time playing, game archives, and chat.

Medusa - Has an interesting but intuitive user interface.

MSN Reversi - Multiplayer game play. Includes game overview and competitive tournaments.

Neave's Webgames - Hexxagon - A variation of the game when the board is at an angle.

Online Reversi Games - A collection of online reversi games, including both single-player and multi-player versions.

Othello - Java applet with different levels of AI and an introduction to strategy.

Rev-Lux - An online Java program, with a winning percentage of over 90%. Adapts its thinking time to that of its opponent.