The Larch Environment (sites.google.com)

Sort of reminds me of the iPython notebook plus some of the ideas from that recent pensive talk + light table ideas. Jython + Graphviz is right up my personal alley. I will have to check it out, but curious about the license.

Reminds me of DrRacket: http://docs.racket-lang.org/quick/

I think it allows you to drop in resources and manipulate them as well.