Viper FTP is a handy and powerful file manager for macOS, with a tremendous user interface that makes it effortless to use.
Forklift - The most advanced dual pane file manager and file transfer client for macOS.
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.
Commander One - Free dual-pane file manager for Mac with PRO Pack of features.
Cyberduck - A libre FTP, SFTP, WebDAV, S3, Backblaze B2, Azure & OpenStack Swift browser.
Xversion - Super easy enterprise class version control.
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).