Aperture Hand Lab is, technically speaking, a video game. This interesting piece of software puts you into the control of a pair of precision-tuned sensor-rich re-imaginings of your very own hands, as they are presented in a high-fidelity simulated reality.
In practice, Aperture Hand Lab lets you take control over your hands in VR. In the Portal universe. Of course, this only works if you've actually got a VR headset and controllers, so your mileage may vary.
Valve is currently all-in when it comes to advanced virtual reality tech (Index), and Aperture Hand Lab is a perfect testing ground for some very precise hand/graspers technology, which is eventually sure to make its way into mainstream VR games.
The main features of this software suite include: grabbing, shaking, and waving, which isn't exactly many gamers' forte or interest. Those who've got some snazzy VR tech laying around, however, could make good use of Aperture Hand Lab.
The application is available as a free download from the official Aperture Hand Lab Steam page, so you might as well check it out. Happy shaking!