MUDs

Metropolis Masterpiece
Entertainment, Games, Online, MUDs, MajorMud - Metropolis Masterpiece. Portal into 7 active MajorMUD games.
http://www.mudarena.com/
MajorMUD - Realm of Legends
The most popular MUD game on the Net is available to purchase for BBS systems and to play for Mudders.
http://www.majormud.com/
mudinfo.net Index page
Entertainment, Games, Online, MUDs, MajorMud - Mudinfo.net. A well-rounded MajorMUD information site with the scoop on quests, maps, ganghouses, monsters, and weapons.
https://www.mudinfo.net/
MegaMud Online!
Entertainment, Games, Online, MUDs, MajorMud - MegaMud Online!. Megamud information, downloads, and paths.
https://www.megamud.net/
StarMUD: The Next Generation
Entertainment, Games, Online, MUDs, LP - StarMUD. A very mixed world set in a strange version of the future.
http://www.starmud.com/
Core 2651
Entertainment, Games, Online, MUDs, LP - Core 2651. Mining Colony in Space.
https://coremud.org/
End of the Line LP Mud
End of the Line, more commonly known as EotL, is a text-based roleplaying game in which you adventure in a myriad of landscapes and realms. It is an LP-style of MUD that was first opened to the public in 1989.
http://www.eotl.org
Ancient Anguish
Entertainment, Games, Online, MUDs, LP - Ancient Anguish. A large custom-world LPMud website, with information about guilds, quests, and roleplaying, including a telnet link to the game and dynamic pages showing game statistics.
http://www.anguish.org/
ZombieMUD.org
Role playing MUD based in Finland.
http://www.zombiemud.org
Geas
Entertainment, Games, Online, MUDs, LP - Geas. A level-less and classless fantasy roleplaying game.
https://www.geas.de/