Freshmeat page: http://freshmeat.net/projects/lyx/?highlight=lyx
LyX is a Document Processor that uses LaTeX as its backend for quality printed pages, while providing the possibility of using SGML (LinuxDoc and DocBook and thus generating content in text-only, HTML and a plethora of other formats) and tens of other document classes (from Articles to Brodway Scripts), Literate Programming and more, in a What You See Is What You Mean interface, with easy access to quality math formulae and any other thing a Document Processor should provide...
License: modified GPL (see http://www.lyx.org/about/license.php3)
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!