Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
Image Resizer for Windows - Lets you resize images by right-clicking.
Phatch - Phatch = Photo & Batch!
File Converter - Convert & compress everything in 2 clicks!