Re:Animatron: HTML5 Animation Editor Inspired by Middle-Scho...
by kawera on Thursday April 17, 2014 @02:57PM
(#7605600)
I've been using this QC toolkit for UI prototyping: http://facebook.github.io/origami/ . Works pretty well.
http://en.wikipedia.org/wiki/Quartz_Composer
Among other things, you can make your own screensaver, and have access to various inputs and outputs such as the built in camera, mic, URL's, etc.