NodeXL: Network Overview, Discovery and Exploration for Excel

Import hyperlink networks into NodeXL with the VOSON System -- a web-based software incorporating web mining, data visualisation, and traditional empirical social science methods (e.g. social network analysis, SNA). 
http://voson.anu.edu.au/node/13#VOSON-NodeXL

Exchange Spigot for NodeXL enables Microsoft Excel plugin NodeXL to collect messaging data from the Microsoft Exchange Server and display that data as a graph.
http://exchangespigot.codeplex.com/

Social Network Importer for NodeXL is a new graph data provider for NodeXL which will allow each user to directly download and import from within NodeXL different Facebook networks. Version 1.7 supports import from Facebook egonetworks, Fan Pages and Groups.
http://socialnetimporter.codeplex.com/

WikiImporter for NodeXL a new graph data provider for NodeXL which allow users to directly download and import different MediaWiki networks.