Shrink O'Matic - Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
ImageOptim - Faster web pages and apps.
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.