DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Ralpha Image Resizer - High-speed image batch conversion tool
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
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.