Alternative (computer) input devices?

Does anyone have any suggestions as to what a friend of mine could replace his #keyboard and #mouse with, please?

He's got quite bad neuropathy in both hands (fuck #chemo) and it's quite difficult for him to use either his keyboard or his mouse now.

Tagging for #disability but I don't know if that's appropriate. If you can think of anything more appropriate please let me know.

Please, please boost!