At Smart Geoemtry 2011, the Responsive Acoustic Surfaces group began an investigation into the sound scattering properties of doubly ruled surfaces. Annotated link http://www.diigo.com/bookmark/http://smartgeometry.org/index.php?option=com_community
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.