~~~Time for my yearly MUD mystery call-out!~~~
MUD fans, possibly only in the NW in the late 90s - did you ever play a MUD that had a replica of Garfield High School in Seattle in it, complete with teachers, rooms, etc? I am desperately hoping it is archived somewhere!
It can be filtered by genre, players on now, max within last 30 days, etc. At this moment it says "There are currently 832 active MUDs listed."
It uses the Mud Server Status Protocol (MSSP) to get its information, which was created because: "MUD listings are often out dated and lack accurate information. Verifying that the one submitting a new MUD is a member of the MUD's administration can be quite tedious as well."
Also the sidebar at http://www.reddit.com/r/mud has a lot of other MUD related links.
It's a shame MUDs expect you to be constantly interacting, I keep being slow and having them time out on me (then having to ;;reset to revive the session ...)
I am the author of a MUD client for iOS that, like most other clients, will capture and silently discard the GOAHEAD character. GOAHEAD is most common on MUSHes but I've seen them in a few MUDs as well.
I don't know why, but this pleases me a great deal.
While I learned how to type faster in general by playing, my wpm for stuff like 'k boba' was off the charts.
Not quite what you're asking for though.
Maybe if I get some time in the coming weeks I'll give it a shot.