Digionica SyncTool - Digionica SyncTool is a useful utility that has been designed for synchronizing files and folders in numerous computers on the net, on local storage, and on servers.
Beyond Compare - Beyond Compare allows you to compare files and folders.
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.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
MirrorFolder - MirrorFolder is a real-time folder synchronization and backup software
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.