- [Syncany](https://www.syncany.org/) - Secure file sync software for arbitrary storage backends, an open-source cloud storage and filesharing application. Securely synchronize your files to any kind of storage. `GPL-3.0``Java`
- [Syncthing](https://syncthing.net/) - Syncthing is an open source peer-to-peer file synchronisation tool. ([Source Code](https://github.com/syncthing/syncthing)) `MPL-2.0``Go`
- [Unison](https://www.cis.upenn.edu/~bcpierce/unison/) - Unison is a file-synchronization tool for OSX, Unix, and Windows. `GPL-3.0``OCaml`
- [Unison](https://www.cis.upenn.edu/~bcpierce/unison/) - Unison is a file-synchronization tool for OSX, Unix, and Windows. ([Source Code](https://github.com/bcpierce00/unison)) `GPL-3.0``OCaml`