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Eboard
An interface for FICS. Quite featureful. GPL, Unix/Linux only.
ICC Interfaces
A thorough collection of Java, Windows, Macintosh and UNIX clients which will work correctly with the ICC chess server.
JavaBoard for FICS
A Java Applet allowing to play on the Free Internet Chess Server. Not very featureful, but gets the job done if you can't install an interface. Freeware, Platform independent.
Knights Chess Interface
Knights is a relatively new graphical chess interface for KDE. It is, however, already quite featureful and very nice looking. Doubles as a chess engine front end. GPL, Unix (KDE) only.