CompreFace - CompreFace is a free face recognition service from Exadel that can be easily integrated into any system using simple REST API.
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
PhotoBulk - PhotoBulk is a bulk image editor for Mac that was created for the best experience of batch editing. With this image editing software for macOS you can add watermarks, optimize and resize pictures, convert images or rename photos in bulk.
facedetect - facedetect is a simple face detector for batch processing.
IrfanView - IrfanView ... one of the most popular viewers worldwide.