Bulk Resize Photos - Resize large photos in bulk
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Bulk Image Resizer by RedKetchup - Resize, convert, or compress multiple images quickly. Compress PNG, JPEG, WEBP, or HEIC images in batch. Convert multiple images to the PNG, JPEG, WEBP, HEIC, GIF, ICO, TIFF, or BMP formats.
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Squash 2 for Mac - The easiest way to compress and optimize images for the web
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.