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Cyberduck is an open source FTP client.

FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.

SmartFTP is an FTP (File Transfer Protocol), FTPS, SFTP, WebDAV, S3, Google Drive, OneDrive, SSH, Terminal client. It allows you to transfer files between your local computer and a server on the Internet. With its many basic and advanced Features SmartFTP also offers secure, reliable and efficient transfers that make it a powerful tool.

Secure, reliable, and efficient file transfers.

Cute FTP is an utility for transferring files between your computer and a remote File Transfer Protocol (FTP) server anywhere on the Internet.

gFTP is a simple GTK+ based ftp client for Linux. Supports the FTP, FTPS (control connection only), HTTP, HTTPS, SSH and FSP protocols, FTP and HTTP proxy server support, supports FXP file transfers (transferring files between 2 remote servers via FTP), UNIX, EPLF, Novell, MacOS, VMS, MVS and NT (DOS) style directory listings, bookmarks menu to allow you to quickly connect to remote sites.Fully Internationalized.