TinyJPG - Compress JPEG images with perfect quality and file size
Squash 2 for Mac - The easiest way to compress and optimize images for the web
ImageResizer - Free online app to crop and resize images
Icecream Image Resizer - Image resizer by Icecream Apps is a program to resize images fast and free. Windows version. Free Download.
Big Photo - Overcome the image resolution limit on iOS devices
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.