SageThumbs - SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats...
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Context Viewer - Context Viewer is an explorer extension in the form of a Control Panel applet that lets you preview...
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
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!
Phatch - Phatch = Photo & Batch!