Freshmeat page: http://freshmeat.net/projects/rosegarden/
MIDI sequencer and musical notation editor.
"Current" (actually 4 years old now) version is 2.1 (unless you count the patch levels). "New" version has had several incarnations, which involved Gnome, CORBA, and now KDE. They are briefly described here. So Rosegarden is probably among the top 5 projects to have stayed in limbo for the longest time.
The last incarnation (KDE-based) is moving forward at a decent pace -- see the homepage.
This project has the following developers:
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