After his great app GameWave – Geert Bevin has released a new free app called HandWave. With HandWave you can control you OS (Windows & MacOS).
http://uwyn.com/handwave : HandWAVE tracks your hand and watches for gestures. It is designed to run in the background and is very smart about filtering out unintended movements so that gestures are never accidentally triggered. You can swipe in four directions, perform circles leftwards or rightwards, tilt your hand or make a fist. All these gestures can be tied to commands that will control your computer.
HandWAVE is free and if you want to unleash the full power of your Leap Motion Controller, it’s easy to upgrade to GameWAVE since its approach will feel immediately familiar :http://uwyn.com/gamewave