Syncthing

Syncthing is a free, open-source peer-to-peer file synchronization program that keeps files in sync between two or more devices in real time, without storing data on a central cloud server. It runs on Windows, macOS, Linux, Android, iOS and BSD, with encrypted transfers and a web-based interface.

• Open-source alternative to: Dropbox, Google Drive
• Licence: MPL-2.0 (Weak copyleft open source)
• Website: https://syncthing.net/
• Source code: https://github.com/syncthing/syncthing
• GitHub stars: 89925, forks: 5566
• Topics: file sync, cloud storage, peer-to-peer, file sharing, backup, go, p2p, synchronization