AllTheFreeStock - All the free stock images, videos and icons in one location
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
CaptionBot by Microsoft - Analyzing and describing images by a bot
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.
Gumlet - Gumlet is an end-to-end video streaming and image delivery platform