This article is from the Anime Resources FAQ, by Steve Pearl with numerous contributions by others.
Before entering the world of MUDs, it is highly suggested that you get the MUCK documents from either piggy.ucsb.edu or glia.biostr.washington.edu. They have a document called mudenc.txt and mudref.txt. Those two files tell you a little on how to get around on a MUCK and how to MUCK. Also, for those of you who wish to program on a MUCK, you might want to get the following text files from the sites: mufman, muftut, mufref. There is also 'info new.muf' and 'info new.prims' on the MUCK for the TinyMUCK 2.2fb4.2f for the FB server's primatives that tend to make a few more things easier (or harder) for the programmer.
- Ani-Mani MOO A Japanese Animation-based game, which provides a 'do-as-you-please' atmosphere. RP and non-RP areas are available, and most of the feature characters are available. Telnet to telnet://anime.otaking.org:6000 and connect guest guest The Official Ani-Mani MOO Home page is located at http://www.otaking.org/~anime/ (still under construction) Administered by 
- AnimeMUCK: The *original* Anime MUD. Telnet to tcp.com:2035 and connect guest guest The Official Anime Muck Home page is located at http://anime.muck.com/ Administered by 
- AnimeMUSH: An alternative Anime MUD. Telnet to anime.mush.com 6260 and connect guest guest Administered by Dee_Ehll(firstname.lastname@example.org)
- AvalonMUCK - 18.104.22.168 4242 A sci-fi/anime/furry MUCK, still quite small.
- Battlestar Mush Homepage http://consider.ferris.edu/bsmweb This is an online role-playing game set in the BSG Universe at a point just after Hand Of God--a neat way to really be a part of the Ragtag Fleet. If you do not have access to a web browser or would like additional information on the game (by email) send a request to email@example.com You can "Telnet" directly to the game at the following address: attend.ferris.edu 4201 Administered by  - BGC MUCK: An alternative Anime MUD. Telnet to bgc.muck.com 2034 Administered by  - Bishoujo Senshi Sailor Moon MUX: Upset that Sailor Moon is off the air in Japan? Not getting enough from reruns and synopses of Sailor Moon? Well here's your chance to continue on with the action of Sailor Moon! You can get in with the action of being with the Senshi and the Dark Kingdom! Join the Bishoujo Senshi Sailor Moon Mux to participate in the world of Sailor Moon at: sailmoon.telmaron.com 6250 For more information, you can visit the website at: http://www.argo.net/~gregclem/bssm Be a part of the Sailor Moon world today! Administered by 
- DahlingMUCK: [Description] Telnet to  and connect guest guest The Official Ranma Muck Home page is located at http://www.netaxs.com/~kahm/dahlingmuck/dahling_index..html Administered by  - FictionMUCK - adobe.chaco.com 7777 - A medium-sized, fiction/anime-based MUCK
- PikuMUCK - chrono.muck.com 2300 - A small, humor-themed anime MUCK. - Ranma Muck: An anime related muck concentrating on the world of Rumiko Takahashi's Ranma 1/2 series. Telnet to ranma.muck.com 1212 and connect guest guest The Official Ranma Muck Home page is located at http://ranma.muck.com/ Administered by 
- ROBOTECH Muck: The theme is Robotech, and the focus is on Roleplaying the lives of the humans aboard the SDF-1. Although combat is _not_ the primary objective, it will in some form be available, but the focus is on Roleplay over either code/building/or combat. It's running PennMush 1.50, pl-10 presently. Telnet to marvin.df.lth.se 2142 (ip:22.214.171.124 2142) Administered by firstname.lastname@example.org
- ShoujoMUCK: [Description] Telnet to ccwf.cc.utexas.edu:2029 and connect guest guest Administered by email@example.com
- Southern Cross MUSH: You a fan of Robotech? Then come check out Southern Cross Robotech MUSH, at aptlabta.wpi.edu 1313. There's always fun to be had.. It's run by Falchion, and they're gonna have one of the best Mecha coded systems ever. Lotsa jobs available.. whether in the Army, or being a sort of high-tech bandit in the Free Born, or Furies. Administered by 
- Spirit of Anime MUCK: An alternative Anime MUD. Telnet to spirit.muck.com:4269 The Spirit of Anime Muck Home Page is located at http://www.spirit.net.au/spiritmuck/anime.html Administered by