FileZilla is the free FTP solution. Both a client and a server are available. FileZilla is open source software distributed free of charge under the terms of thee GNU General Public License. 
FileZilla Features
Overview
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.
Features
Among others, the features of FileZilla include the following:
- Easy to use
- Supports FTP, FTP over SSL/TLS (FTPS) and SSH File Transfer Protocol (SFTP)
- Cross-platform. Runs on Windows, Linux, *BSD, Mac OS X and more
- IPv6 support
- Available in many languages
- Supports resume and transfer of large files >4GB
- Powerful Site Manager and transfer queue
- Bookmarks
- Drag & drop support
- Configurable transfer speed limits
- Filename filters
- Network configuration wizard
- Remote file editing
- Keep-alive
- HTTP/1.1, SOCKS5 and FTP-Proxy support
- Logging to file
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