TANAGRA is a free DATA MINING software for academic and research purposes. It proposes several data mining methods from exploratory data analysis, statistical learning, machine learning and databases area.
Using RhNav - Rhizome Navigation I wrote a data aggregator for Technorati's API. The first result is a video which visualizes blog domains by analysing Technorati's Cosmos (the blogs which link to a particular URL). The video is a screencast of RhNav fetc
W. Duan, B. Gu, and A. Whinston. Social Science Research Network (SSRN) Working Paper Series, (2005)http://ssrn.com/paper=616262. Version as of January.
L. Dini, and G. Mazzini. Proceedings of the Conference on Data Mining Methods and Databases
for Engineering, Finance and Other Fields (Data Mining), page 299--310. (2002)