FTP Synchronizer - Secure and high performance FTP File Sync product
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
FTPSync.pl - FTPSync.pl is a PERL skript to synchronize a local directory tree and a remote FTP directory tree.
FileCloud - FileCloud is an enterprise file share, sync and mobile access solution.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
CloudXplorer - This cloud storage management system enables the clouds users to manage and explores their favorite cloud storage accounts in a more systemized way.