orbs is a real-time hardware-accelerated simulation of the light deflection effects in the vicinity of a black hole. These effects are made visible through a ring-like particle cluster around the origin and a spherical background texture, while the user is free to shift perspective by holding the left mouse button and moving as well as using the mouse wheel.

The only supported platform for orbs is linux. orbs is build using make with the dependencies X11, OpenGL, glew, libjpeg and libpng.