MUDShell (Popularity: )
http://www.mudshell.com MUD hosting, source code and clients. Unix shells for eggdrops and iRCd. A MUD resource site by MU* designers.
Tinymush (Popularity: )
http://tinymush.sourceforge.net/ A MUD hosting service specializing exclusively in TinyMUSH and TinyMUX "managed service" hosting. Server code and maintenance provided, together with ...