Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.
YOLO - Real-time object detection
Amazon Rekognition - Add Amazon's advanced image analysis to your applications.
Vize.ai - custom vision API - Image recognition API. Use your own Artificial Intelligence
CaptionBot by Microsoft - Analyzing and describing images by a bot
Clarifai - The World's AI