Optimage - Advanced image optimization tool
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Compare to Dev - Image comparison 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
Imagify - Optimize and resize images online and through your CMS.
Ralpha Image Resizer - High-speed image batch conversion tool