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CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
Million.js - A fast, <1kb virtual DOM
CloudExplorer - Cloud Explorer is a open-source Amazon S3 client.
Google Stackdriver Error Reporting - Aggregates and displays errors produced by cloud services
Uppy - The next open source file uploader for web browsers
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.