I've run PerlMud 3.0 using the java app that comes with it -> it's by far the easiest mud to set up I've come across (had to change 3 variables -> url, port, pwd) and set it loose ... I even populated it with a few simple bots to give students (I teach EFL) others to interact with ... but switched over to Lambdamoo/enCore for the superior GUI
If you go poking around there's lots of perl muds up and running ... PerlMud 2.0 is particularly popular for some reason ... anyway - the one advantage that PerlMud has over other mud/moos (IMO) is the @reload command - which reloads the mud lib on the fly - no shutdown required ...