imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
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.
TinyJPG - Compress JPEG images with perfect quality and file size