The Dasher Project

The wiki at https://en.m.wikipedia.org/wiki/Locked-in_syndrome says:

Assistive computer interface technologies, such as Dasher combined with eye tracking, may be used to help people with LIS (Locked-in syndrome) communicate with their environment.

Basically imagine inputting text with your mouse like this:

http://www.inference.phy.cam.ac.uk/dasher/images/newdasher.g...