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File Transfer (FTP) Clients

FileZilla

FileZilla Client is a fast and reliable cross-platform FTP, FTPS and SFTP client with lots of useful features and an intuitive graphical user interface.

 

SmartFTP (Windows)

SmartFTP is an FTP (File Transfer Protocol), FTPS, SFTP, WebDAV, S3, 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.

Transmit (Mac)

Transmit is an excellent FTP (file transfer protocol), SFTP, S3 (Amazon.com file hosting) and iDisk/WebDAV client that allows you to upload, download, and delete files over the internet. With the most Mac-like interface available, Transmit makes FTP as simple, fun, and easy as it can possibly be. 

This is a commercial FTP client but if you do a lot of FTP it is well worth the money.  This is our favorite FTP client.