Literature

The Clan
[Messageboards] Freeform roleplay based on the Earth's Children novels of Jean M. Auel.
http://www.angelfire.com/nf/ClanRPG/

Druids of Paranor
[PBEM] Based on the Shannara series by Terry Brooks. Players can be warrior, healer or mystic druids. Rules, current character roster and application forms.
http://www.druidsofparanor.org/

The Heroes of D'Hara
[Messageboards] Based on Terry Goodkind's "Sword of Truth" series. Freeform gameplay.
http://p219.ezboard.com/btheheroesofdhara

The Krul Raptor Pack
[IRC] Based on the book "Raptor Red" by Robert Bakker. Players play utahraptors, progressing through from youngster to adult. Rules, how to join and current members.
http://krulraptorpack.8m.net/

Night World Clubs
A webring for role-playing games based on the worlds of Lisa Jane Smith.
http://www.freewebs.com/nightworldclubs/

Starshield
[Messageboards] Listserve for the Starshield setting created by Tracy Hickman and Margaret Weis. Players design and run empires in space.
http://groups.yahoo.com/group/starshield-rpg/