GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Dropbox - Online Sync and File Sharing
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
arRsync - arRsync is a tool that is designed for macOS that is used for transferring and synchronizing files between a computer and a storage drive.
Google Drive - Access and sync your files anywhere
MirrorFolder - MirrorFolder is a real-time folder synchronization and backup software