Shrink Me - Compress images with one drag / click
TinyJPG - Compress JPEG images with perfect quality and file size
ImageResizer - Free online app to crop and resize images
Watermark.ink - Online Photo Watermarker
Big Photo - Overcome the image resolution limit on iOS devices
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!