Anime.js - Lightweight JavaScript animation library
Uppy - The next open source file uploader for web browsers
Pixi.js - Fast lightweight 2D library that works across all devices
Uploadcare - File uploading, media processing & content delivery for modern web apps
Substance - A JavaScript library for web-based content editing
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.