Freshmeat page: http://freshmeat.net/projects/mutt/
Mutt is a small but very powerful text-based MIME mail client. Mutt is highly configurable, and is well suited to the power user with advanced features like key bindings, keyboard macros, mail threading, regular expression searches and a powerful pattern matching language for selecting groups of messages.
In other words, ``All mail clients suck. This one just sucks less.'' (1995, Michael Elkins, the author of Mutt)
License: GNU GPL
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!