Freshmeat page: http://freshmeat.net/projects/papaya
Papaya is a simple to use, but fully featured, graphical GTK MUD client for Linux, UNIX and Windows. Whilst having all the standard features such as ANSI colour, aliases, triggers, multiple connections etc, Papaya also has a number of non-standard features including a number of firewall bypassing connection methods (Socks 4/5, Turf HTTPd, Squid CONNECT), MCCP (mud client compression protocol), IPv6 and plugins in both C++ and Python which further enhance Papaya's capabilities.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!