链接分析工具

http://en.wikipedia.org/wiki/Social_network_analysis_software [looks very nice]
http://www.kdnuggets.com/software/link-analysis-social-networks.html

*** http://networkx.lanl.gov
looks very nice; python

*** http://igraph.sourceforge.net/
quite nice python

http://jung.sourceforge.net/applet/showlayouts2.html
seems rather nice, scalable, java

http://www.sonivis.org
java, seems very interesting

http://nwb.slis.indiana.edu/index.html
looks interesting too

NodeXL
A plugin for Microsoft Excel that provides very nice tools (is especially useful for people that are not familar with programming)

 

Gephi
Up and comming open source graph visualization and analysis platform written in Java (w/ support for plugins).