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
T. Tourwé, and K. Mens. Proceedings of the 4th IEEE International Workshop on Source Code Analysis and Manipulation (SCAM 2004), page 97--106. IEEE Computer Society, (2004)
F. Gatzemeier, and O. Meyer. Proceedings of the 10th International Conference on Conceptual Structures (ICCS 2002), volume 2393 of Lecture Notes in Computer Science, page 107-121. Springer, (2002)