Here are some interesting computer input devices that I am aware of. If you know of others please let me know.

KeMice

KeyMice website

This is similar to the Combimouse. They only advertise it for use with Android tablets. I think it has many problems but I have included it because of it’s similarity to Combimouse. Click here for the video.

Mycestro

Mycestro website

Leap Motion

Leap Motion website