WinSCP - WinSCP is an open source free SFTP client and FTP client for Windows.
Forklift - The most advanced dual pane file manager and file transfer client for macOS.
FileZilla Secure - A modified version of Filezilla dedicated to keeping your FTP passwords secure.
AndFTP - AndFTP is a FTP client for Android devices. It allows managing several FTP servers.
BitKinex - Bitkinex is a multiprotocol FTP client, supporting FTP, SFTP, HTTP (WebDAV).
Hitonic FTPSync - Fast file uploading from a local computer to an FTP server!