IRC

Doudryll RPG
Set in a new world setting, with many new races to form the basis of new plots.
http://www.freewebz.com/doudryll/

The Meade Hall
A free-form online role-playing game, open to players from all genres.
http://www.meadehall.org/

Sime~Gen Roleplaying on IRC
Free form role playing in the universe of the Sime/Gen novels by Jacqueline Lichtenberg and Jean Lorrah.
http://www.secretpens.org/ffrpg/index.html

Southridge Fortress
Fantasy roleplaying with no set game system, albeit some use of Advanced Dungeons and Dragons rules for character creation.
http://www.geocities.com/Hollywood/5872/southridge.html

Sword & Serpent
A free form roleplaying game with character descriptions.
http://www.angelfire.com/nc/swordandserpent/