Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
FTPbox - FTPbox is an open-source application that allows you to synchronize your files to your own host...
Letsupload - You can upload any type of files.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
FTPSync.pl - FTPSync.pl is a PERL skript to synchronize a local directory tree and a remote FTP directory tree.
Dropbox - Online Sync and File Sharing