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Dolphin File Manager

Filezilla is an free and open-source FTP software that can be used to transfer files over the FTP, FTPS and SFTP protocol. The application consist of FileZilla Client and FileZilla Server. The FileZilla Client is used to connect to FTP services whereas FileZilla Server can be used to create and host your own FTP server.

Cyberduck is a free and open-source client for FTP and SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox. Cyberduck is written in Java and C# using the Cocoa framework and is available for macOS and Windows.

Forklift is one of the most advanced dual pane file manager and file transfer client for macOS. Forklift connect to SFTP, FTP, WebDAV, Amazon S3, Backblaze B2, Google Drive, Rackspace CloudFiles, SMB, AFP, and NFS remote volumes and easily manage your files quickly across networks. You can connect to multiple servers at a time and even copy between them with drag and drop. Forklift is also avalible though your menu bar and lets you mount a saved remote connection as disk, upload files to a remote server from Finder by drag and drop, or run a saved Synclet even if ForkLift is not running.