Freshmeat page: http://freshmeat.net/projects/gnudenemo/
Denemo is the GNU graphical music notation editor. It runs on the Linux operating system. Denemo is written above the GTK+2 library. It helps you quickly prepare notation for publishing with LilyPond. Denemo does NOT strive to display all notation graphically or be the most complete graphic enviroment.It is a graphical front end to LilyPond. If you are looking for a WYSIWYG editor Denemo may not be for you. If you are looking for a way to quickly prepare scores for final editing in LilyPond give Denemo a whirl
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!