Ergonomic / Vertical Mouse
Evoluent Vertical Mouse
This one is the best for those with hand injury using the mouse.
They have left-handed version, and wired or wireless.
Anker Ergonomic Mouse
This one is very cheap. There are wired and wireless versions.
EV Ergonomic Mouse
SmartNav Natural Point Hands Free Mouse
You wear a headlamp-like thing to your head, it shoots a lazer pointer, and the screen detects the pointer. So, basically you just move your head slightly to move pointer.
TrackIr 5 Optical Head Tracking System
This one is mostly gamers playing flight simulator games. It is not a mouse substitute, but supplement.
Lots positive reviews on amazon.
You can try trackball. See Best Trackballs 2017
there's also Contour Roller Mouse