Catgwap is a physics planning game about controlling catom ensembles. It was designed for SIGBOVIK 2009, and the current version reflects the fact that it is, at present, 3am the day before the conference. So it's a bit rough around the edges.
But there is a download below. Give it a try and send me some feedback; I get excited about projects that people like, and projects I'm excited about get worked on.