1. Diff Match and Patch libraries for Plain Text. https://code.google.com/p/google-diff-match-patch/. Diff Match and Patch libraries for Plain Text. https://code.google.com/p/google-diff-match-patch/.
2. inotify - monitoring filesystem events. http://man7.org/linux/man-pages/man7/inotify.7.html. inotify - monitoring filesystem events. http://man7.org/linux/man-pages/man7/inotify.7.html.
3. rsync. https://rsync.samba.org/. rsync. https://rsync.samba.org/.
4. seafile. https://github.com/haiwen/seafile. seafile. https://github.com/haiwen/seafile.
5. Farsite