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.
Neuromancer: [PBEM] Based on William Gibson's "Neuromancer". Players are hackers. Features player lists, rules and procedures, FAQs, world information, and how to join.
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.
The Clan: [Messageboards] Freeform roleplay based on the Earth's Children novels of Jean M. Auel.
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.