NodeXL

NodeXL is a free and open Excel 2007 Add-in / a C# .NET library for network analysis and visualization.
Project Page
NodeXL is hosted on Codeplex .
Features
It integrates into Excel 2007 and 2010 and adds directed graph as a chart type to the spreadsheet and calculates a core set of network metrics and scores. Supports extracting email, Twitter, YouTube, WWW and flickr social networks. Accepts edge lists and matrix representations of graphs. Allows for easy manipulation and filtering of underlying data in spreadsheet format. Multiple network visualization layouts. Reads and writes UCINet and GraphML files.
Book
Analyzing Social Media Networks with NodeXL is a broad introduction to using NodeXL for collecting, analyzing, and visualizing social media data. This volume aims to introduce the public to the field of social network analysis, and lower the threshold for discovering patterns of connections between people and/or social media objects. The book is aimed at a general audience, and does not assume familiarity with programming or graph theory.

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