Yahoo! Reversi:The biggest reversi gameroom on the internet, with realtime playing and chat. Includes an automatic rating system and a ladder.
Ajax: Java othello applet with a friendly interface and a very strong engine.
Cyrano: A strong Othello applet
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 comprehensive 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.