Journalistic - A simple, yet powerful micro journaling app
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
Punkt - Private & secure one-sentence journaling
Kauna - Kauna is a music visualizer. Kauna renders any sound reproduction in system.