blink.totype.org — type with your webcam
This site uses intentional blinks to operate a simple typewriter.
If it does not work well for you, please check out look.totype.org which tracks side-to-side eye movements instead.
Requirements
The typewriter needs a webcam, a well-lit room, and a device with sufficient processing power.
Most laptops will work if they are not too old. Modern tablets may work as well. Most phones will struggle.
Current versions of Chrome, Firefox, Safari and Edge are all compatible.