CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
Bashupload - Upload files from command line to share between servers
Uppy - The next open source file uploader for web browsers
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
tus.io - File Uploads
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.