3D Connexion Space Navigator

When you first look at it, it might look like part of an airplane or a prop from a sci-fi flick. But actually it's used for navigation in certain applications. It plays second fiddle to the usual mouse or trackpad (meaning that it doesn't direct the mouse pointer). And you do need to install the supplied software for it to work.

The knob, which is the main control, is used for panning, zooming, and rotating. The side keys are programmable using the supplied software. You can use the Space Navigator with Adobe Photoshop and 3D design software like 3D Studio Max, Maya, and AutoCAD. It really is a spectacular piece of design; not just because of the superb construction and materials, but because it responds to the slightest touch and can replace complicated mouse movements with simple, intuitive motions. It can save a lot of time and effort. Fantastic for the intended purpose if you have the budget.