QualiEYE hands free cursor control system is an assistive technology
breakthrough for people with ALS, spinal cord injuries, and other people with
disabilities who require a hands free mouse alternative. 

QualiEYE is a software solution which works with any standard USB Web Cam.

Turn your head and the cursor will follow! No gear on your head! QualiEYE
translates user's head motion into the motion of the cursor on the screen, by
processing the images from a standard USB video camera.  

Simply turn your head or aim your finger, and the cursor follows, in real
time! QualiEYE analyzes in real-time the images coming from the Web Cam, and
tracks the movements. These movements are analyzed and automatically
converted into cursor movements at a specific speed.  

No external devices or dots are required. You just need to be in front of the
Web Cam. Totally free.  

http://www.mctos.com/htm/Qualieye.htm