Cosmic Sugar VR Pro (PC)

This is the pro version of Cosmic Sugar. Particles form a simple but elegant physics sandbox. The secret is in the instruments which allow users to visualize complex and dynamic forces. In addition to gravity, the only tool available in the free version, the Pro version includes a variety of instruments:

Cymatics
Orbit
Noise
Draw
Draw a line between controllers
Draw a curved line between controllers

It includes global sliders:

Speed and Mass
Saturation and Brightness
Noise
Audio Reactivity
Brush Radius and Distance

It allows you to play with 1,2,4, and 8 million particles simultaneously.
(also playable on Oculus Rift)