Ansible MOO - Text-based role-playing game, set in the Orson Scott Card novel, Ender's Game.
The Clan - [Messageboards] Freeform roleplay based on the Earth's Children novels of Jean M. Auel.
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.
The Heroes of D'Hara - [Messageboards] Based on Terry Goodkind's "Sword of Truth" series. Freeform gameplay.
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.
Night World Clubs - A webring for role-playing games based on the worlds of Lisa Jane Smith.
Starshield - [Messageboards] Listserve for the Starshield setting created by Tracy Hickman and Margaret Weis. Players design and run empires in space.
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