GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Easy Context Menu - Easy Context menu is a Freeware portable utility that includes useful tweaks for the context menus.
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.
Shell context menu manager - Powerful and lightweight context menu manager for Windows File Explorer.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Link Shell Extension - Link Shell Extension (LSE) provides for the creation of Hardlinks , Junctions , Volume Mountpoints...