Uppy.io - Next open source file uploader for web browsers
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
Bashupload - Upload files from command line to share between servers
transfer.sh - Easy file sharing from the command line
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.