Marrying d3js's force directed graph implementation with GeoJSON so you can abuse map-making tools like TileMill to make big big force directed graphs.
npm install -g force-geojson
force-geojson foo.json > foo.geojson
The input needs to be formatted like d3 wants it to be: read the docs.
Takes a few options:
times: how many iterations to work on the graph positionpadx: how close points can get to -180 and 180 longitudepady: how close points can get to -90 and 90 latitude