Browser Based

BrowserChess
Online chess game playable against the computer or other players. Includes message board and Hall of Fame.
http://www.browserchess.com/

Chess5
With Chess5 you can store your chess games online and send them by email, or let other members evaluate your chess games.
http://www.chess5.com

Chess Board
An online game which provides unique URLs indicating each move. Users play by sending the URLs to each other.
http://chessboard.de/

Chess Hounds
Offers gameplay, message board, and chat.
http://chesshounds.com/

Chess Lab
Play Chess real-time online. No downloads needed. Search and analyse over 2 million chess games in current database. Does not behave well on Macintosh, particularly with System 9+ and not at all with IE.
http://www.chesslab.com

Chess Mail
E-mail and browser based correspondence chess with multilingual ability.
http://www.chessmail.org/

Chess On The Web
Play correspondence chess online against fellow chess enthusiasts.
http://www.chessontheweb.com/chess/home

Chess Stop
Offers online chess, play-by-email, and PGN files.
http://chessstop.com/

Chess World
Play a casual game or participate in one a tournament (thematic, round robin, swiss system). Games can be timed or not. There is a test area where you can go to play a few moves in non-counting games just to see how the site works.
http://www.very-best.de/PC.htm

ChessAge.com
Offers correspondence chess, tournament reports including online game replay, opening database, and discussion forum.
http://www.chessage.com/

ChessAnyTime.com
Free online chess game played against live opponents. Includes top 100 players list.
http://www.chessanytime.com/

ChessClan.com
Allows to play online correspondence chess. Contains world chess news and forum.
http://www.chessclan.com

ChessGames.com
Free, searchable chess game database and community.
http://www.chessgames.com

ChessHere.com
Browser based online chess with database, forums and links.
http://www.chesshere.com/

ChessManiac.com
Offers turn-based correspondence chess. Also has a forum.
http://www.chessmaniac.com/

Chess.net
Free site with for-pay premium services. Requires client which can be downloaded (Windows only) or play with Java client in browser. (Does not appear to work on Macintosh.)
http://www.chess.net

Chessplayer.com
Presented by 1994 US Open Champion IM Georgi Orlov. Instruction, articles, and puzzles.
http://www.chessplayer.com/

Chesstr.com: Chess Problems and Tactics
An online database of user-submitted chess problems grouped by tactical motif. Features daily problems, aesthetic ratings, and a kibitzing forum.
http://www.chesstr.com

ChessWorld.net
Web based play-by-email server. Features include tournaments, leagues, forums, voting, and annotated games.
http://www.letsplaychess.com/chessclubs/asplogin.asp

CompWebChess
CompWebChess is an open source chess program and application which allows users to play chess over the internet.
http://www.compwebchess.com

CowPlay Chess
Offers news and gameplay. [Membership required.]
http://www.cowplay.com/

Cup of Chess
Play real-time chess with friends or others around the world in seconds. No downloads or registration required to play unlimited games for free. Register to track games and ratings.
http://www.cupofchess.com/

eChess.org
Browser based chess service that makes it possible to play chess through email.
http://echess.org/

Exeter Chess Club
Advice and discussions of opening strategy, sorted by chess rating relevance.
http://www.ex.ac.uk/~dregis/DR/

FMO CHESS CLUB
A free online chess club, fully featured, ratings, tournaments, teams, Chess clocks, forums,blog, audio links. Kids area, Mature players, Ad free and peaceful
http://chess.stumegan.net

Free Internet Correspondence Chess and Go Server
At FICGS you can play class, rapid and special chess tournaments for free.
http://www.ficgs.com

Gambit Chess
Specialty site devoted to chess players who enjoy playing various opening gambits. Features online play in gambit-themed tournaments, notes, articles, analysis.
http://www.gambitchess.com/

GameKnot Chess
Online chess community. Online play, tournaments, chess league, and thematic mini-tournaments.
http://gameknot.com/

GrandMaster Chess
Grandmaster site of 1999 FIDE World Chapmpion Alexander Khalifman and other top Grandmasters. Instruction, news, links, gamebase, and puzzles.
http://www.gmchess.com/

How Stuff Works
Several short articles illustrating how computers play chess. Very basic and easy to understand.
http://www.howstuffworks.com/chess.htm

InstantChess.com - Play chess online
The computer automatically pairs you up with an opponent from around the world. No registration is required.
http://www.instantchess.com

Kung Fu Chess
A new fast-action version of chess where both players move simultaneously. Registration is required to play.
http://www.kungfuchess.com

The London Chess Center
Home base for two British publications, The Week In Chess (TWIC) and Chess Monthly. Downloadable games to study and move-by-move analysis of live events.
http://www.chesscenter.com

MindZine - Chess News
Chess news and articles from all around the world by Mind Sports Worldwide. News, features, polls, updated roundups of other chess Web site contents.
http://www.msoworld.com/mindzine/news/chess/chess.html

Net-Chess
Host server for correspondence games and sets of related matches. Email notification, ratings, user-selectable interface design.
http://www.net-chess.com

Online Chess at Lokasoft
Play a game of chess against Lokasoft's chess program or solve a chess quiz.
http://www.lokasoft.nl/play.htm

Online_chess
Play, view and download chess games. Flash-based
http://chessmasters.eu/

Pirate Chess 2003
Java-based gameplay. Includes instructions.
http://www.geocities.com/piratechess2003/

Play against tkChess
Play chess against a computer at Yale.
http://pine.cs.yale.edu/cgi-bin/cp

Play correspondence chess games worldwide with real players.
A free browser based correspondence chess game playing site. Players have their own account, so their score and game history are viewable publicly. A small chess site with a good community feel.
http://che55.com

PlayChess
Offers private chess games with list of challengers, tournaments, PGN downloads, message boards, and directory of annotated games. Requires paid membership and includes free trial as a guest.
http://www.playchess.de/

Postcard Chess
Offers correspondence chess with web based postcard system. Includes book store, problems and a chess playing CGI program.
http://www.postcardchess.com/

Queen Alice Internet Chess Club
Community of correspondence chess players of all levels and ages. Only a web browser is required to play.
http://www.queenalice.com/

Queenside.net
Play chess against a computer wherever you are.
http://www.queenside.net/

Real Chess
Offers Beholderboard and Webchess, also links, shopping, and forums.
http://www.realchess.com/

Red Hot Pawn
Online correspondence chess played against friends or other members. Includes community forum and email notification of moves.
http://www.redhotpawn.com/

Scheming Mind
Club offering correspondence chess and variants in-browser.
http://www.schemingmind.com/

SoundChess
Email chess application playable against a friend.
http://www.soundkeepers.com/chess/e_mail_chess/index.php3

TheChessKing.com
Online turn-based chess games played against live opponents. Includes player rankings.
http://www.thechessking.com/

TheChessWorld
Place where you can play browser based chess, study openings, solve daily puzzles, enhance your strategy and tactics, read articles that can make you a master.
http://www.thechessworld.com

uChess
Global community of blitz chess players. Includes chat and game analysis tools.
http://www.uchess.com/