for Complex Networks Concentric Measurements
Boost Graph Library (BGL)
Universal Network/Graph Framework
JUNG provides a common and extendible language for the modeling, analysis, and visualization of data that can be represented as a graph or network.
A popular program for network visualization.
Open source graph drawing software.
Used to study communication relations in groups, kinship relations or the structure of animal behavior.
Software for Social Network Analysis.
Programs for Social Network Analysis
This site offers links for many other softwares used in social network analysis.