BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.
Uppy.io - Next open source file uploader for web browsers
Bashupload - Upload files from command line to share between servers
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
transfer.sh - Easy file sharing from the command line
Jumpshare for Windows - Incredibly fast, real-time file sharing