It has been a few weeks that I have been interested in open-source analysis and visualisation tools and software and so far my favourite is Gephi. Gephi has been selected for the Google Summer of Code in 2009, 2010, and 2011.
Today I played a little bit with existing dataset that Gephi let you download and work with them to try out some of the features that it has.
What its official website says about Gephi:
Gephi is an interactive visualisation and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs.
Runs on Windows, Linux and Mac OS X. Gephi is open-source and free.
OK, here some screen shots that I took while I was working on existing datasets. Later i will try to see what else I can find out side this world to be fun to analyse and visualise 

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