TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
piZap - Free online photo editing software.
ImageOptim - Faster web pages and apps.
Photoshop.com - Photoshop.
TinyJPG - Compress JPEG images with perfect quality and file size
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.