SageThumbs - SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats...
Photo Size Optimizer - Photo Size Optimizer for Mac is a powerful photo resizer and optimizer to optimize photos by 80% ~ 20%.
MysticThumbs - MysticThumbs generates thumbnails of many image types not natively supported by Windows.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Pictus - Pictus is a fast, free image viewer that enables Windows to see thumbnails of supported formats, such as PSD. Give it a spin today!
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000