MotionMouse moves your mouse pointer according to movements of your head and upper body. Clicking the mouse can be done via hot keys or by using special head gestures like nodding or head shaking.
Work more efficent with your hands always on the keyboard.
Work hands-off without using a mouse.
Diversify your movements to avoid Gesundheit problems.
Enjoy the experience!
All you need is a not too old Windows-PC and a camera with a frame rate of at least 15 Hz and which supports Video for Windows. Place the camera in front of you like you would to do a video conference. Make sure the lights are bright enough to allow real 15 Hz frame rate (there are pretty good light sensitive cameras around for not too much more money) and there you go!