Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.