CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
tus.io - File Uploads
Pagekite - Bring your localhost servers on-line.
Uppy - The next open source file uploader for web browsers
Gotty - GoTTY is a simple command line tool that turns your CLI tools into web applications.