Image Resizer for Windows - Lets you resize images by right-clicking.
FILEminimizer Pictures - FILEminimizer Pictures compresses JPEG photos, TIFF, BMP and PNG images and pictures by up to 98%.
Assetizr - A super fast image resizing tool
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Squash 2 for Mac - The easiest way to compress and optimize images for the web
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.