Uppy - The next open source file uploader for web browsers
Color Hunter - Color Hunter is a place to find and make color palettes created from images.
Uploadcare - File uploading, media processing & content delivery for modern web apps
OpenCV - OpenCV is the world's biggest computer vision library
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.
GraphicsMagick - GraphicsMagick is the swiss army knife of image processing.