Introducing NodeXL, an open-source template for Excel (Microsoft) 2007 and 2010 that makes it easy to explore network graphs. With NodeXL, you can enter a network edge list in a worksheet, click a button and see your graph, all in the familiar environment of the Excel window. Follow the link below to download a copy and learn more.
NodeXL Download Page
The business intelligence tools for Excel just keep getting better. The NodeXL project is sponsored by the Social Media Research Foundation, a group of researchers dedicated to creating open tools, generating and hosting open data, and supporting open scholarship related to social media.