OpenCV - OpenCV is the world's biggest computer vision library
Immerse Reverse Image Search - With a deep understanding of artificial intelligence, immerse.zone provides a reverse image search engine for hundreds of millions of image libraries, including stock photos, vectors, videos, GIF, etc.
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.
Kailua Labs Image Search API - Easily search images and text with AI that can see
Clarifai - The World's AI
Pond5 - Pond5 is an online marketplace for royalty-free media that offer stick footage, stock music, stock photography, effects, images, and 3D models.