Image Converter Plus - Image Converter Plus is a multifunctional conversion and resizing tool for Windows operating system.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
FileStar - With FileStar you can "do anything with any file".
Ralpha Image Resizer - High-speed image batch conversion tool
ImageMagick - ImageMagick is a software suite to create, edit, and compose bitmap images.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.