UCINET - UCINET for Windows is a software package for the analysis of social network data.
Gephi - Gephi is an open-source software for visualizing and analyzing large networks graphs.
SocNetV - Social Network Visualizer (SocNetV) is a cross-platform, user-friendly free software application for social network analysis and...
Centrifuge - Centrifuge is a complex and highly useful data analysis tool that allows for interactive data exploration.
Graphviz - Graphviz is open source graph visualization software. It has several main graph layout programs.
KeyLines - The JavaScript toolkit for graph visualization