Qtzweb: A Quartz Composer to WebGL & JavaScript Compiler
Synapse is an app for Mac and Windows that allows you to easily use your Kinect to control Ableton Live, Quartz Composer, Max/MSP/Jitter, and any other application that can receive OSC events. It sends joint positions and hit events via OSC, and also sends the depth image into Quartz Composer. In a way, this allows you to use your whole body as an instrument.
CoGe is a free, open-source, semi-modular Quartz Composer powered VJ Application for Mac OSX with a solid, minimalistic look and feel. It's an unconventional application, because has not built-in media handle feauters or effects. With the excellent Quartz Composer support, you can build your own media handlers, effects, mixer and automatization modules.