OpenCV - OpenCV is the world's biggest computer vision library
Keras - Keras is a minimalist, modular neural networks library, written in Python and capable of running on top of either TensorFlow or Theano.
Microsoft Computer Vision API - Extract rich information from images and analyze content with Computer Vision, an Azure Cognitive Service.
TFlearn - TFlearn is a modular and transparent deep learning library built on top of Tensorflow.
Amazon Rekognition - Add Amazon's advanced image analysis to your applications.
Clarifai - The World's AI