There's a few modern frameworks for MUD-type games that are being worked on. Evennia is one in python that's been great fun to play around with, though it's fairly bare-bones out of the box - it's up to you to design systems like combat and so on.
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I liked the mystic lpmud style stuff ... MUDDs of all versions were great though!
Also, the spiritual successors like RENPY (python) are awesome - renpy.org/ - nothing like a choose your own adventure book :)
There's a few modern frameworks for MUD-type games that are being worked on. Evennia is one in python that's been great fun to play around with, though it's fairly bare-bones out of the box - it's up to you to design systems like combat and so on.