Scikit-learn. The guys have done, and are continuing to do, an amazing job and the output is completely free. There is some funding involved, but the ultimate v

Scikit-learn. The guys have done, and are continuing to do, an amazing job and the output is completely free. There is some funding involved, but the ultimate value/cost ratio is ridiculously high. "How Open Source is Really Maintained" comes to mind: https://cdn-images-1.medium.com/max/1280/1*Q_8HbGbbfEmAjwPqB8D60A.png https://cdn-images-1.medium.com/max/1280/1*Q_8HbGbbfEmAjwPqB...