Clientes de FTP open source

Exiten clientes FTP de codigo abierto, lo mejor
Yo recomiento :

WinSCP Free SFTP, SCP and FTP client for Windows

Una solucion cliente, de los protocolos ftp muy intuitiva para windows.
 






La solucion GNU cliente y servidor para Windows.

Client	Creator	First public release date	Latest stable version	Software license	Copy files over 2 GB limit[1]	Interface
cURL	Daniel Stenberg	1998	7.47.1 (February 8, 2016; 40 days ago[2]) [±]	MIT	Yes	CLI
Cyberduck	David V. Kocher	2001	4.6.1 December 18, 2014; 14 months ago	GPL	Yes	GUI
FileZilla	Community	2001 (January)	3.16.1 (16 March 2016; 3 days ago) [±][3]	GPL	Yes	GUI
FireFTP	Mime Čuvalo	2004 (September)	2.0.24.1-signed (May 18, 2015; 9 months ago) [±]	MPL 1.1, Charityware	Yes (since version 2.0.5)	Firefox addon
Fugu	University of Michigan Research Systems Unix Group	2003	1.2.0 May 2, 2005; 10 years ago	BSD	?	GUI
gFTP	Brian Masney	1998	2.0.19 November 30, 2008; 7 years ago	GPL	Yes	GTK+
lftp	Alexander V. Lukyanov	1996 (August)	4.6.5 (December 10, 2015; 3 months ago [4]) [±]	GPL	Yes	CLI
Macfusion	Michael Gorbach	?	2.0.4	BSD	?	GUI
NcFTP	NcFTP Software Inc.	1991	3.2.5 January 17, 2011; 5 years ago	Clarified Artistic License	Yes	CLI
net2ftp	David C. Gartner	2003 (January)	0.98 March 1, 2013; 3 years ago	GPL	?	Web application
Swish	Alexander Lamaison	2007	0.7.0 July 30, 2012; 3 years ago	GPL	Yes	Windows Explorer shell extension
tnftp	Luke Mewburn	1999	20130505 May 5, 2013; 2 years ago	BSD	?	CLI
WinSCP	Martin Přikryl	2000	5.7.7 (March 6, 2016; 13 days ago[5]) [±]	GPL	Yes	GUI and CLI
Yafc	Sebastian Ramacher	1999	1.2.5 (June 15, 2013; 2 years ago) [±]	GPL	Yes	CLI

Fuente: https://en.wikipedia.org/wiki/Comparison_of_FTP_client_software