ccny_rgbd is collection of tools for real-time visual odometry and 3D mapping using RGB-D cameras such as the Kinect. The software is developed at the CCNY Robotics Lab and is available for download.
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.