But we here at Hackaday don’t judge based on alternate input lifestyles, and we quite like this billiard ball trackball mouse. A trackball aficionado, [Adam Haile] spotted a billiard ball ...

Although it's hard to eliminate that problem entirely, you can massively improve your wrist health with a capable ergonomic mouse. From vertical mice to trackballs, adaptive customizable designs ...

The mouse has since become totally ubiquitous ... There are several solutions for that, but the oldest one is probably the trackball. Ploopy is an open source trackball you can build yourself ...