Tools to support live coding as in Bret Victor's “Inventing on Principle” talk

Question

I\'ve watched an already well known video where Bret Victor, former Apple UI designer shows amazing demos with immediate updates of running code after changing literally one

Answer 1

Code orchestra guys recently released their livecoding tool called C.O.L.T. It supports JavaScript and ActionScript and looks very promising. Highly recommended to try it out.