Python-graph - A library for working with graphs in Python. yEd - Graph Editor. yEd is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams.
Create diagrams manually, or import your external data for analysis. Our automatic layout algorithms arrange even large data sets with just the press of a button. yEd is freely available and runs on all major platforms: Windows, Unix/Linux, and Mac OS X. The latest release is version 3.12.2. Home. ZGRViewer. Current Version Stable: 0.10.0 (March 2015) Development: 0.10.1-SNAPSHOT through SVN only (March 2015)
Gephi, an open source graph visualization and manipulation software. Visualize your LinkedIn network.