ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
PhotoReducteur.pics - Online JPEG/WEBP/PNG Compression Tool
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Mass Image Compressor - Mass Image Compressor is easy to use - a point and shoot batch image compressor and converter tool for Web site optimization, photographers, HTML game creator and casual Windows users.