Gephi, an open source graph visualization and manipulation software

The Open Graph Viz Platform

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.
Learn More on Gephi Platform »
Release Notes | System Requirements

Features
Screenshots
Quick start
Videos

screenshot
Gephi 0.8.1-beta has been released! Discover a new Timeline, dynamic ranking and weighted community detection. Learn More »
Applications

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.
Learn More »
Metrics ready

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.