Imagify - Optimize and resize images online and through your CMS.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Cloudinary - Cloudinary is a cloud-based service for hosting videos and images designed specifically with the needs of web and mobile developers in mind.
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.