Dasher is an information-efficient text-entry interface, driven by natural continuous pointing gestures. Dasher is a competitive text-entry system wherever a full-size keyboard cannot be used.

GitHub - JuliusSweetland/OptiKey is an assistive on-screen keyboard which runs on Windows. It is designed to be used with an eye-tracking device to bring keyboard control, mouse control and speech to people with motor and speech limitations, such as people living with Amyotrophic Lateral Sclerosis (ALS) / Motor Neuron Disease (MND). (Via: Tweakers.net - Ontwikkelaar brengt opensourcesoftware voor ALS-patiënten uit