A low cost open-Source DIY 3D motion sensor to become another alternative to the Kinect:
The DUO is the world’s first and only DIY 3D sensing solution.
The DUO comes in many forms: with open hardware plans, molded cases, kits and fully assembled devices. All paired with an open source Driver, SDK and examples. Resulting in a professional grade solution for 3D sensing using stereo vision.
The best part is it’s extremely easy to use, just plug it in, download the software and you can start playing within minutes. If you can wave in the air you can use a DUO.