FreeTrack is a free optical motion tracking application for Microsoft Windows, released under the GNU General Public License. Its main function is inexpensive head tracking in computer games and simulations but can also be used for general computer accessibility, in particular hands-free computing. Tracking is sensitive enough that only small head movements are required so that the user's eyes never leave the screen.
It makes it possible to control your point of view in a video game or simulator, with small head movements. What could be more natural than to turn your face towards the rear view mirror to look in this rear view mirror? How to make it simpler than to just lower your eyes to check the switch of the headlights of your Cessna?
More information is available here.
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