SWmud.org
- Features several guilds, races and planets. Characters may join the imperial, rebel or neutral movements. Roleplaying is not enforced and help is available for new players.
- http://www.swmud.org/

StarMUD
- A very mixed world set in a strange version of the future. Features race, domain information and a good howto.
- http://www.starmud.com/

DuneMUD
- Official site for this world based on Frank Herberts work. Features information about guilds, the people and newbie help.
- http://dune.servint.com/

Core 2651
- Mining Colony in Space. Mud clients, references, rules and guidelines, mining colony status information, and latest updates.
- http://www.coremud.org/

End of the Line
- Many player races and classes, as well as exciting and interesting players. Offers areas of both fantasy and futuristic. MUD is constantly evolving.
- http://www.eotl.org

OuterSpace
- Set in a future where humans have finally made contact with other civilizations. Features new player help, descriptions of guilds and planets.
- http://mud.stack.nl/