Leap Motion

It goes where no device has gone before.

With a wave of a hand or lift of a finger, you’re about to change the way you use your computer. The Leap Motion Controller senses how you move your hands, the way you move them naturally. So you can point, wave, reach, and grab. Even pick something up and put it down. Just like in real life. It’s an amazing device for the things you do every day and for things you never thought you could do.

https://www.leapmotion.com/product