Steam Controller - The precision of a mouse, the comfort of a controller
Mac Mouse Fix - A simple way to make your 3rd party mouse better.
ODiN Air Mouse - The world's first projection mouse
Smooze - Smooze animates your scroll and adds functionality to your non-Apple mouse (scroll-wheel mouse).
KeyMouse - Re-inventing the keyboard with a built-in mouse
Smart Scroll - Smart Scroll makes scrolling smoother, faster and more comfortable: