OfxKinect-demos is a project mainly written in C++ and C, it's free.
demos for ofxKinect (Kinect openFrameworks addons)
/* A bunch of demos for using Kinect with openFrameworks. Copyright (c) 2010 Memo Akten http://www.memo.tv
Using ofxKinect by Theo Watson, Dan Wilcox and co. github.com/ofTheo/ofxKinect
based on libfreenect by Hector Martin "marcan" git.marcansoft.com/?p=libfreenect.git
This code is licensed to you under the terms of the GNU GPL, version 2 or version 3; see: gnu.org/licenses/old-licenses/gpl-2.0.txt gnu.org/licenses/gpl-3.0.txt
More info on the opensource kinect drivers at github.com/OpenKinect/openkinect */