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Apex Web Gaming - http://apexwebgaming.com/
Lists online, multiplayer, and downloadable games, MMOs, MMORPGs, MPOGs in categories that include pets, role playing, strategy, action, sports, cards, board, classic, sim, MUD, and trivia/puzzle.
The Online Gaming Network - http://theogn.com/
Dedicated to providing a comprehensive directory and rating system of today's multiplayer online games.