Color Hunter - Color Hunter is a place to find and make color palettes created from images.
Uppy - The next open source file uploader for web browsers
iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
Uploadcare - File uploading, media processing & content delivery for modern web apps
Image Color Summarizer - The web service provides statistics describing color characteristics of an image identified by URL.
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.