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.
Delux Wireless Vertical Upright M618
Comanro Ergonomic Ev Mouse
- Comanro Human Ergonomic Ev Mouse
- DPI 500/1000/1800/2500 adjustable
SmantNav 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