VPT 7, a projection powerpack.
VPT (VideoProjectionTool) is a free multipurpose realtime projection software tool for Mac and Windows created by HC Gilje.
Among other things it can be used for projecting video on complex forms, adapt a projection to a particular space/surface, combine recorded and live footage, for multiscreen HD playback, for interactive installations using arduino sensors or camera tracking ++
VPT has become a popular tool for theatre and installation use, but is also used by VJs. The previous version,VPT 6, was downloaded over 20000 times.