Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Squash 2 for Mac - The easiest way to compress and optimize images for the web
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
punchi.me - Edit one or several images in a few clics.