Multiplayer

Big Bang Chess 2.02
[Commercial $25] Included in Big Bang Board Games Bundle, Mac OS X with 3D board, network play with Rendezvous [updated 10/19/2004]
http://www.freeverse.com/bbbg/

Craig Knelsen's Online Chess Links
Links and descriptions for 11 sites by the author of Fixation 2.0.
http://cknelsen.sasktelwebsite.net/chess/

Fixation 1.41
[Freeware] Graphic interface for Internet chess servers. Does not require Power Macintosh.
http://www.adum.com/comp/fix.html

Glyph Chess
[Freeware] Cross-platform network chess for OS/X, Windows 98+. Released Nov 2004.
http://www.tabberer.com/sandyknoll/more/chess/index.html

Ignatius Chess Client 1.0b
Free Client software for the Internet Chess Club, OS 10.3 or higher required.
http://www.versiontracker.com/dyn/moreinfo/macosx/24357

Internet Chess for Macintosh
Interface for the commercial "Internet Chess Club" server (ICC)
http://www.chessclub.com/helpcenter/interface/mac_download.php

Jin
Grahical client for the Internet Chess Club and the Free Internet Chess Server. Contains screenshots, a wiki, and downloads.
http://www.jinchess.com/

OTChess 1.5.2
[Shareware $5] [Download link] Peer-Peer internet chess game.
http://hyperarchive.lcs.mit.edu/HyperArchive/Archive/game/brd/ot-chess-152.hqx

PowerICS
[Freeware] Graphical interface for the free internet chess servers.
ftp://ftp.freechess.org/pub/chess/Macintosh/PowerICS_Z-1.5.hqx