Fast GPU-based physics simulation in Grasshopper supports free particles, fluids, rigid bodies, soft bodies, cloth, inflatables and custom constraints

Zebra is a live multi agent behavior system(also known as Flocking or Swarming). Used to achieve design goals using agents.

Sculptured, organic modeling in 3D. SubD like interface, but advanced surfacing for high quality, geometrically rich shapes.

Box2D is a 2D rigid body simulation tool for Grasshopper. It uses Box2D physics engine and a C# wrapper from colgreen/box2Dx. 

PhysX.GH is a rigid body simulation tool for Grasshopper, using open source real-time physics engine NVIDIA PhysX.

This grasshopper component joins meshes in Rhino with similar materials so that you can reduce the number of meshes in a scene

Pong Game for Rhinoceros.   Use Up/Down keys to move the stick if you are in perspective (the sticks are in sides) if you rotate the scene

A simple Tournament Bracket Generator.