Gephi, an open source graph visualization and manipulation software
Gephi is an interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs.
Runs on Windows, Linux and Mac OS X. Gephi is open-source and free.
Exploratory Data Analysis: intuition-oriented analysis by networks manipulations in real time.
Link Analysis: revealing the underlying structures of associations between objects, in particular in scale-free networks.
Social Network Analysis: easy creation of social data connectors to map community organizations and small-world networks.
Biological Network analysis: representing patterns of biological data.
Poster creation: scientific work promotion with hi-quality printable maps.
Centrality: used in sociology to indicate how well a node is connected. Available: degree (power-law), betweenness, closeness.
And more: density, path length, diameter, HITS, modularity, clustering coefficient.
Ergonomic interface: based on NetBeans UI
High-performance: built-in 3D rendering engine.
Native file formats: GDF (GUESS), GraphML (NodeXL), GML, NET (Pajek), GEXF and more.
Customizable by plugins: layouts, metrics, data sources, manipulation tools, rendering presets and more.