FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
FTP Synchronizer - Secure and high performance FTP File Sync product
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.
xfdesktop - The xfdesktop application manages the desktop backdrop.
GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Rodent - Rodent is a project file manager for browsers; it helps you organize your work without saving files locally.