Here’s a summary of Gephi’s capabilities:
Import existing networks in a variety of formats or create a new network.
Edit a new or existing network by adding or removing nodes or edges.
Change the size and color of node icons, the size and color of label font, and the color and thickness of edges based on node and edge attributes.
Calculate basic network measures: centralities, clustering coefficients, path length distributions, connectedness, and modularity.
Apply various layout engines to the network graph.
Execute additional plug-ins.
Export modified networks in a variety of formats. ...