Photos on macOS - Photos keeps your images organized and accessible. Rediscover favorite shots with Memories. Access them on your devices with iCloud Photos.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Movavi Photo Manager - Focus on the memories, forget about managing photos
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Ralpha Image Resizer - High-speed image batch conversion tool