OpenCV - OpenCV is the world's biggest computer vision library
python pillow - The friendly PIL fork (Python Imaging Library). Contribute to python-pillow/Pillow development by creating an account on GitHub.
Microsoft Computer Vision API - Extract rich information from images and analyze content with Computer Vision, an Azure Cognitive Service.
Amazon Rekognition - Add Amazon's advanced image analysis to your applications.
pgmagick - Yet Another Python wrapper for GraphicsMagick
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.