is a browser-based gravity game where players create planetary systems and watch them evolve. The more crowded and chaotic the system, the better!
http://www.stefanom.org/spc/
review - https://speakerdeck.com/exostefanom/dot-astronomy-6-super-planet-crash-and-apps-for-astronomy-education
http://www.stefanom.org/spc/
review - https://speakerdeck.com/exostefanom/dot-astronomy-6-super-planet-crash-and-apps-for-astronomy-education