Is there any "Graphical Model Editor" for PyQt4?

[xinor]

Hi everyone,

I need a "Graphical Model Editor" for my PyQt4 project. For my project it is allowed to use code that is already available. But I can't find any. It should be a gui, where you can use the mouse to build a graphical model, something like this:
URL removed
Hope someone of you knows a project like this or where I can find code.


Best,
Xinor