Top 10 machine learning libraries

Numpy/Scipy: numpy.org
Scikit-Learn: scikit-learn.org
Keras: keras.io
TensorFlow: tensorflow.org
Theano: deeplearning.net/software/theano
Pandas: pandas.pydata.org
Caffe/Caffe 2: caffe.berkeleyvision.org
Jupyter: jupyter.org
CNTK: microsoft.com/en-us/cognitive-toolkit
NLTK: nltk.org

For more info checkout TalkPython Episode #131 where Pete Garcin talks about all these libraries: https://talkpython.fm/episodes/show/131/top-10-machine-learning-libraries