Ansible MOO - http://www.ansiblemoo.org/
A roleplaying game based on the battle school from the novel by Orson Scott Card, Ender's Game.
GreeneThorne's Realm - http://greenethorne.tripod.com/
Has information on custom gaming software in addition to reviews and analysis of different RPG based games.
MMORPG Kostenlos - http://www.kostenlose-mmorpg.com
Free-to-play MMORPGs are getting more and more popular all over the globe. Here you can find your favorite game among all kind of roleplay games.
Roleplayer Guild - http://roleplayerguild.com/
Forum based play-by-post role playing games from fantasy to futuristic settings where members create and interact with freeform user-driven characters, story lines, and settings.
RolePlayGateway - http://www.roleplaygateway.com/
Aims to provide an open roleplaying community in which roleplayers have the opportunity to build lasting friendships with one another through their common pastimes.
Rondak's Portal - http://www.rondaksportal.com/
This is a fully featured site that allows adventurers and referees to interact in worlds of fantasy, science fiction, or of their own creation.