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
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
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.