Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Developed by Jakob Borg
License: Open Source
FreeFileSync is primarily focused on backup and file synchronization with a user-friendly interface, making it ideal for one-time or scheduled syncs. In contrast, Syncthing excels in real-time synchronization and continuous file sharing, making it suitable for users needing constant updates across devices.