Chess.net
Chess.net
http://www.chess.net/
Chessworld.net
Play free online chess
http://www.letsplaychess.com/
Free Internet Chess Server
Fics - free internet chess server is a server for chess players to play against each other over the internet. fics supports tournaments, lectures, live game relays, chess variants (suicide, bughouse, crazyhouse, atomic) and lots more.
http://www.freechess.org/
Internet Chess Club
The internet chess club, where beginners to grandmasters play online. serious chess. serious fun!
http://www.chessclub.com/
Russian Chess
Russian chess, the chess site devoted to the main chess events, chess games, chess analyses and chess education
http://www.ruschess.com/