visually stunning gravity simulator

 Gravit is a free, visually stunning gravity simulator,
 where you can spend endless time experimenting
 with various configurations of simulated universes.
 .
 Features:
  - Stunning visualisations
  - Create unlimited variations of simulations
  - You can view the simulation in
    3D without glasses using stereoscopic imaging
  - Can be installed as a screen saver in Windows
  - You can record, then play back at any speed
  - Stores every particle's position for every frame in memory
  - Compresses history when needed, for very long recordings
  - Mouse controllable rotation
  - Console with script execution
  - Colours can be based on mass, velocity, acceleration,
    momentum or kinetic energy
  - Save and Load simulations
  - Update display/input while recording a frame