Ximilar - Ximilar is a Computer Vision platform that allows you to build and train Deep Learning models for Image Recognition, Detection, and Visual Search. Allows you to download a model for offline usage or connect to them via API.
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.
Amazon Rekognition - Add Amazon's advanced image analysis to your applications.
CompreFace - CompreFace is a free face recognition service from Exadel that can be easily integrated into any system using simple REST API.
Facebook Computer Vision Tags - Show Facebook computer vision tags in Google Chrome
CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.