Great work. I wonder if the author had heard of the Eyewriter project [1]? Similar system, fully open source, but I'm not sure how active development is nowadays. It's been up since ~2011, though, so quite old by software standards (uses openFrameworks/openCV). Still, it worked impressively well when I built a derivative system.

The accessibility space needs as much open-source development as possible - most of the commercial tech, if you can find it, is locked down and outdated.

[1]: http://www.instructables.com/id/The-EyeWriter-20/