Interactive graph tool, moving vertices around

Hi,
I am looking for a graph tool where I can generate a graph from data and, after plotting the graph, drag the vertices around with the mouse, so I can position them as I like. Is this possilbe with Graphviz? Is there an external tool I can use for this purpose?

Interactive graph tool,

 hi i am looking for a tool that generates a distance matrix from a dot graph

try gephi

 try "gephi"

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