FY - nbody particle simulation using equation

This is a simple nbody simulation that runs using any equation that you can write. I created on my spare time to learn how changes on equations can affect particle simulation. It's on early stage, it's missing a lot of features but I saw it could be useful for somebody else. So please, don't expect too much.
It can also be used for game developer to test physics equations before applied to the game in order to save some time.
If you find it useful and need a special feature, please leave a comment.