It is linked at the top of the article. It is a physics-based sandbox building game. Back in the day it was commercial, but it was abandoned a while back and somewhat more recently released as open-source.
It is linked at the top of the article. It is a physics-based sandbox building game. Back in the day it was commercial, but it was abandoned a while back and somewhat more recently released as open-source.
It's also the name of an n-body physics mod for Kerbal Space Program.
https://github.com/mockingbirdnest/Principia