FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Treecomp - TreeComp is a utility to keep 2 directory trees and the files within the directories in sync. Download from this site!
Qtd Sync - A graphical interface for the Rsync engine that will synchronise files between two computers either...
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.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Dshutdown - Utilities freeware by Dimio, DShutdown, DSynchronize, HDHacker, DTaskManager and DSpeech