I highly recommend Weka, http://www.cs.waikato.ac.nz/~ml/weka/ http://www.cs.waikato.ac.nz/~ml/weka/. I used it for river flow forecasting (published a paper) a

I highly recommend Weka, http://www.cs.waikato.ac.nz/~ml/weka/ http://www.cs.waikato.ac.nz/~ml/weka/. I used it for river flow forecasting (published a paper) and it was very good. We ran about 100 different models, various neural nets, SVM, logistic regression, multilinear regression, etc. I spent about a month trying different tools and liked the understandability of Weka. Scikit-learn calls out to C for the heavy lifting, which is great but it's not exactly easy to read and understand the code.