GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Syncovery - Syncovery will copy your files the way you need it. 30-day trial. Back up your data and synchronize PCs, Macs, servers, notebooks and online storage space. Download for WindowsSyncovery backup software for windows.
SyncBack - Backup software for the PC: powerful, easy to use solution for backing up and synchronising files on a local/network drive, the cloud, FTP server and more.