Discover free, open-source, and secure ways to sync your files across your devices. There aren't many recommendations here, but it's better than nothing.
Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Your data is your data alone and you deserve to choose where it is stored, if it is shared with some third-party, and how it is transmitted over the Internet.
- git-annex - Allows managing files with git, without checking the file contents into git. While that may seem paradoxical, it is useful when dealing with files larger than git can currently easily handle, whether due to limitations in memory, time, or disk space.