Maybe this can interest you (with the actual/next Polygon converter of Max Smirnov)
(of course it's like Grasshopper from Rhino, only for Nodes' lovers! :)

http://www.world-machine.com/ (the free version is sufficient for some crazzy things! )

For export you must "draw" a node "Mesh OutPut" (seems only OBJ ? )

There are some Voronoi, Perlin etc... functions! The Manual is a model!



and this guy has made some many tutorials! Vladimir Chopine http://www.youtube.com/user/GeekatplayStudio/playlists