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Eike Decker wrote:

I think it would be nice to provide an editable graph representation
of the content. Unfortunately, this is likely to be written by
oneself, at least I am not aware of a generic grapheditor (but I have
not googled on that... you might do that yourself ;) ).
I've written a graph editor to help program fragment shaders. It was written for Insomniac Games, but it's freely available under the Nocturnal initiative: http://nocturnal.insomniacgames.com/index.php/Main_Page
The nodes are scripted in Lua so it should be easy to add nodes related to graph dialogs. Nodes generate code which can also be customized.
The app was written using wxWidgets and the graph is rendered using GraphViz. The good thing about this is that the graph is always well organized. The bad thing is, you cannot determine the graph organization. 

Cheers,

Andre