NearDrop - An unofficial Google Nearby Share app for macOS
Send Anywhere - Send whatever you want, wherever you want
PairDrop - Local file sharing in your browser. Inspired by Apple's AirDrop. Fork of Snapdrop.
ShareDrop - HTML5 clone of Apple's AirDrop - easy P2P file transfer powered by WebRTC
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.