rsync is a utility for efficiently transferring and synchronizing files across computer systems, by checking the timestamp and size of files. Developed by Wayne Davison
License: Open Source
FreeFileSync is a user-friendly synchronization tool with a graphical interface that supports real-time sync and cloud storage. In contrast, rsync is a powerful command-line tool favored for its efficiency and flexibility, especially in Unix/Linux environments, but lacks a GUI and real-time sync capabilities.