Gephi's an incredible project for making big node-link diagrams. It has a selection of layout algorithms and statistics you can apply to nodes and edges. I used

Gephi's an incredible project for making big node-link diagrams. It has a selection of layout algorithms and statistics you can apply to nodes and edges. I used it at a hackathon to visualize the Marvel Universe social graph: http://exposedata.com/marvel/ http://exposedata.com/marvel/