Think of the potential for helping people with physical disabilities. Normally, if you can’t operate a mouse or keyboard you’re stuffed (for using computers), unless you can spend a fortune on custom built stuff.
‘Minority report’ interface?
Gestures instead of typed codes? (Maybe Gandalf was on to something)
Robot vision / object tracking / counting?
Endless possibilities...
Probably the coolest bit of freeware I’ve ever seen on the Web.