OpenCV - OpenCV is the world's biggest computer vision library
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Clarifai - The World's AI
Ralpha Image Resizer - High-speed image batch conversion tool
Google Vision AI - Cloud Vision API provides a comprehensive set of capabilities including object detection, ocr, explicit content, face, logo, and landmark detection.
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats