LibPixel is a realtime image manipulation service for any images that are available on the internet.
LibPixel works by fetching images from an existing Image Source, processing them on the fly and responding with the modified image. You simply supply the image size or processing you want in the query string in the URL you use for the image (perhaps in an IMG tag), and LibPixel does the rest. LibPixel is designed to be fast. It is likely that the transit/download time will be far more significant than the time taken by LibPixel to process the image, so in practice processed images are delivered as fast or faster (due to caching and CDN) than the original image.
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
Uppy - The next open source file uploader for web browsers
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.
Filestack - Simple file uploader and robust APIs for uploading, transforming, and delivering any file into your app. Filestack is a collection of tools and powerful APIs that make it simple to upload, transform, and deliver content.
imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
Uppy.io - Next open source file uploader for web browsers