Google Stackdriver Error Reporting - Aggregates and displays errors produced by cloud services
Uppy - The next open source file uploader for web browsers
Million.js - A fast, <1kb virtual DOM
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.
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
Uploadcare - File uploading, media processing & content delivery for modern web apps