Chris creates and edits films with cerebral palsy
I'd never heard specifically of Discovery Envoy but this software enables this kid (or guy, I could not tell how old he was) to use his Mac to the fullest. With his head. It's quite awesome.
Apparently this software doesn't work with Mountain Lion and may never be upgraded. But anyway, this kid is surfing your web sites without hands (also without voice software like Dragon Naturally Speaking).