Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
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.
FTPbox - FTPbox is an open-source application that allows you to synchronize your files to your own host...
WinSCP - WinSCP is an open source free SFTP client and FTP client for Windows.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.