syncthing/syncthing

Syncthing is a continuous file synchronization program. In plain terms, it keeps a folder on one computer in sync with the same folder on one or more other computers, automatically and in the background. If you add a file on your laptop, it appears on your desktop a moment later, if you edit a document on your phone, the new version shows up everywhere else you have linked. The repository describes itself as peer-to-peer, meaning the computers talk directly to each other instead of uploading everything to a central cloud service first. The goals listed in the README, in priority order, are: never lose user data, never allow eavesdropping or unauthorized modification, be easy to use, work automatically without bothering the user, run on every common computer, and stay focused on individual users rather than enterprise needs. To achieve those goals, releases are GPG-signed, and there is a built-in automatic-upgrade mechanism that verifies updates with a compiled-in ECDSA cryptographic signature. The macOS and Windows binaries are also code-signed. Several community-built graphical interfaces exist for Windows, Mac, and Linux, and a Docker setup is provided for running it in a container. The project is written in Go and licensed under the Mozilla Public License version 2. Use Syncthing when you want files automatically replicated between your own devices without trusting a third-party cloud service such as Dropbox or iCloud, when you want to keep family backups across machines, or when you simply want one folder mirrored across several computers you control.