Has anyone started a project similar to Grasshopper (Rhino) for blender? For a while now I've been interested in prototyping parametric ways to generate geometry. The nodeview of Grasshopper reminds me a lot of the nodeviews we have in blender.  

I was thinking, with the new pynodes feature maybe somebody has started to do work on node based parametric geometry creation, or does pynodes not make that possible?

edit: I'm already able to write scripts that generate parametric geometry  using BMesh API.

edit2: example video of Grasshopper in action
Sverchok

There is such a tool, it is called Sverchok. It's russian for "Cricket" as a sign of respect to Grasshopper. Sverchok is a Blender add-on that works on all platforms, and has over 180 node types. 


The project github page: https://github.com/nortikin/sverchok/ (including download links)
Ask questions on the issue tracker


To get a sense of what people are making with Sverchok checkout the google+ group   


sverchok community