SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
Resolutionator - Resolutionator makes it simple to use any of your display's available resolutions.
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.