What are the communication Aids available for ALS/MND patients?

Tobii EyeTracker 4C with Optikey open source software

If you have a LAPTOP, the most cost effective device that one can use for communication for ALS/MND is a Tobii Eye Tracker 4C device ($169) with OptiKey open source software

Vikram, one of  the member of our MND group has created visual slides one can use