The Cup-O MUD client is a fully functional client for Multi-User Virtual Environments (MUVEs, aka MUDs, MU*s, MOOs, etc), written in the Java programming language. The Cup-O MUD applet allows embedding an active, real-time link to a MUVE system right into a web page or web system, which is immediately available to any user running a Java-capable WWW browser.
The home page can be found at http://moo.du.org/java/CupOmud/.
The home page can be found at http://www.boutell.com/perlmud/client.html.
SMM++ is a MUD client with mapping functionality. You need itcl and tcl/tk to run this client.
The home page can be found at http://www.physik.uni-dortmund.de/~issevers/SMM++/welcome.html.
This Java based client was designed by the CollegeTown? MOO development team at Buena Vista University to make it easy for MOO users to view and display Web Pages from inside their virtual communities.
The home page can be found at http://www.bvu.edu/ctown/stclient.html.