syncthing.net
Syncthing is a continuous file synchronization program that synchronizes files between two or more computers in real time. Communication is secured using TLS with perfect forward secrecy, and each device is identified by a cryptographic certificate. The protocol is documented and the source code is available on GitHub. It runs on macOS, Windows, Linux, FreeBSD, Solaris, OpenBSD and other systems, and is configured through a browser interface.
