Amazon Rekognition - Add Amazon's advanced image analysis to your applications.
PixLab - PixLab is a machine learning SaaS platform which offer computer vision and media processing APIs.
OpenCV - OpenCV is the world's biggest computer vision library
Lambda Face Recognition API - Lambda is a free, open source face API which offers both face detection and face recognition.
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.
Affectiva - Affectiva provides emotion measurement technologies used to understand how people feel in order to improve products and experiences.