OpenCV
SHOGUN -- JMLR
scikit-learn -- JMLR
PyBrain -- JMLR

Mahout/SparkML

C++
dlib    -- JMLR
MLPACK  -- JMLR
Orange  -- JMLR
Waffles -- JMLR
ROOT
http://root.cern.ch/drupal/content/about



J. Bergstra, D. Yamins, D. D. Cox (2013). Hyperopt: A Python Library for Optimizing the Hyperparameters of Machine Learning Algorithms. Proc. SciPy 2013. 



J. Bergstra, N. Pinto, D. D. Cox (2013). Skdata: Data Sets and Algorithm Evaluation Protocols in Python. Proc. SciPy 2013. 
