MUDs

JediMUD
JediMUD (multi-user dungeon) is a text-based, Internet role-playing game, that has existed since 1992. Currently we host over 11,000 different characters.
http://jedimud.com/
SWmud - based on the Star Wars universe since 1994
telnet://swmud.org:6666 - Star Wars MUD, or SWmud, is a telnet text-based game set in the Star Wars universe, mostly during A New Hope to the Thrawn campaign. Player killing is optional. Great space combat and newbie help!
https://www.swmud.org/
Iconoclast
Entertainment, Games, Online, MUDs, Roleplaying - Iconoclast. Game overview, maps, connection details, contact details, message board, online shop, fiction and news.
https://www.iconoclast.org/
Armonia's Escape From Destiny
Our MUD consists of a completely original fantasy world called Vastil. You get to create and develop your own character, choosing from a variety of races and classes. You will make friends and enemies as you explore the world and compete.
http://escape.wolfpaw.net/
Dark Mists - Interactive MUD RPG
Dark Mists is an interactive MUD RPG, an Online Role-Playing Game with a medieval fantasy setting. Players from all over the world connect in real time and design characters to play within the Dark Mists world.
https://www.darkmists.org/
Avatar III - The Crypt Portal
Entertainment, Games, Online, MUDs, Roleplaying - Avatar III - The Crypt. Allows play with multiple classes, questing and parties.
https://www.avatar.co.uk/
Mirrors of the Wheel MUD
Entertainment, Games, Online, MUDs, Roleplaying - Mirrors of the Wheel. Player-run game with selection of races and clans, quests and raids.
https://mirrorsmud.net/
Age of Dragons MUD
Entertainment, Games, Online, MUDs, Roleplaying - Age of Dragons MUD. A Multi-User Dungeon (MUD) set in the Dragonlance world of Krynn.
http://www.ageofdragons.com/