Quartz Composer is a graphics programming environment that is part of Apple's XCode developers tools.
Among other things, you can make screen savers and music visualizers. To download, you must register as Developer with Apple. Most of these are old links.
qcOsc - a plug-in to receive OSC messages in Quartz
http://hexler.net/software/qcosc
Quartz community resources:
http://www.hybridvisuals.nl/tag/quartz-composer/
http://www.youtube.com/watch?v=MyC0Bs1IyMQ -G
http://www.youtube.com/watch?v=7Z6aH0enaKQ&feature=related -G
You can also search the web for files ending .qtz
http://www.quartzcompositions.com/phpBB2/upload/details.php?file=265 - zb