Compressnow - Compressnow is a web service used for compressing the image to be used for different purposes in the websites or promoting the products as this is a problem for both web developers and end-users.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
ImageRecycle - Image/PDF online compression service.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
ImageResizer - Free online app to crop and resize images
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.