1. RapidMiner -- Data mining, ETL, OLAP, BI,
http://sourceforge.net/projects/rapidminer/
2. scikit-learn: machine learning in Python,
http://scikit-learn.org/stable/
3. The SHOGUN machine learning toolbox,
http://www.shogun-toolbox.org/
4. Weka 3 - Data mining with open source machine learning software in Java,
http://www.cs.waikato.ac.nz/ml/weka/
5. Guyon I, Elisseeff A (2003) An introduction to variable and feature selection. J Mach Learn Res 3:1157–1182