Core FTP is a secure FTP software brand that includes a free desktop FTP client (Core FTP LE), a commercial FTP client (Core FTP Pro) and an FTP server (Core FTP Server).
Cyberduck is a free open source file transfer client for Windows and Macintosh desktops.
Cyberduck offers support for FTP, FTPS, SFTP, Amazon S3, Rackspace Cloud Files, Google Storage for Developers and Amazon Cloud Front. Cyberduck features sychronization across multiple server types and support for many languages.
Cyberduck’s official site is cyberduck.ch. It is licensed under GNU.
WS_FTP LE is a free commercial file transfer client for Windows desktops. The current edition is built on WS_FTP Home‘s code base and was reintroduced to the market in 2010.
WS_FTP LE offers a two-panel user interactive user interface and its supported protocols are all variants of FTP/S.
WS_FTP LE is a stripped down version of WS_FTP Professional. The main features missing from the stripped down version are SFTP and scripting/scheduling.
The original version of WS_FTP LE was one of the most popular pieces of freeware ever (nearly a hundred million downloads). The original combination of WS_FTP LE and WS_FTP Professional provided one of the most successful implementations of the now-common “freemium” software business plan ever.
FULL DISCLOSURE: The president of File Transfer Consulting pushed through the retirement of WS_FTP Home and the return of WS_FTP LE while serving as VP of Product Management at Ipswitch.