Syncany - Syncany is an open-source cloud storage and filesharing application.
FileZilla - FileZilla is an FTP, or file transfer protocol, client. It lets individuals transfer single files or batches to a web server. For many years, FTP was the standard for website design. Read more about FileZilla.
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
DPLOY - An FTP/SFTP deployment tool built in node.js
FTPbox - FTPbox is an open-source application that allows you to synchronize your files to your own host...
Cloudu - Secure German online storage and file sync service. Apps for all major platforms.