Top Free Data Mining Software: Review of 50 + top data mining freeware including Orange, Weka,Rattle GUI, Apache Mahout, SCaViS, RapidMiner, R, ML-Flex, Databionic ESOM Tools, Natural Language Toolkit, SenticNet API , ELKI , UIMA, KNIME, Chemicalize.org , Vowpal Wabbit, GNU Octave, CMSR Data Miner, Mlpy, MALLET, Shogun, Scikit-learn, LIBSVM, LIBLINEAR, Lattice Miner, Dlib, Jubatus, KEEL, Gnome-datamine-tools, Alteryx Project Edition , OpenNN, and ADaM

Source: 50 Top Free Data Mining Software – Predictive Analytics Today