imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
Bulk Resize Photos - Resize large photos in bulk
Gumlet - Gumlet is an end-to-end video streaming and image delivery platform
Dribbble Resizer - Resize your designs for sharing on Dribbble