Node Graph Stack ?

Hi community, i am looking for a stack to build an interactive node graph where every node can be associated to a url. I would like people to be able to connect nodes and depending on the branching, load an url or another. I know it is a little bit off topic because as far as i know Jo did not create such a thing. But there are so much softwares using node graphs that i am wondering if the concept could be ported to a stack...

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