ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
OpenCV - OpenCV is the world's biggest computer vision library
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
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.