Galaxy genesis is a project where you can:
Simulate gravity by adding in many different planets.
Load planets from file, meaning you can share galaxy's between people.
You can change modes with in the game, these mode at the moment are:
Mode 1: All planets have negative mass therefore repel each other.
Mode 2: Normal mode everything is as it is in real life.
Mode 3: Game mode where the planets are stationary and you battle to control the universe.
And many more things to come.