YOLO - Real-time object detection
CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.
Vize.ai - custom vision API - Image recognition API. Use your own Artificial Intelligence
Clarifai - The World's AI
Dashmote - Dashmote bundles stock image providers to make finding stock images as easy as possible.
Rubric - Generate an instant, cool caption for your photo