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.
Amazon Rekognition - Add Amazon's advanced image analysis to your applications.
TFlearn - TFlearn is a modular and transparent deep learning library built on top of Tensorflow.
Clarifai - The World's AI
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.