Wikipedia
FileZilla
FileZilla is a free software, cross-platform FTP application, consisting of FileZilla Client and FileZilla Server. Client binaries are available for Windows, Linux, and Mac OS X, server binaries are available for Windows only. The client supports FTP, SFTP and FTPS (FTP over SSL/TLS). Support for SFTP ( SSH File Transfer Protocol), which can be used to share folders over a network, is not implemented in FileZilla Server.
FileZilla's source code is hosted on SourceForge and the project was featured as Project of the Month in November 2003. However, there have been criticisms that SourceForge bundles malicious software with the application; and that FileZilla stores users' FTP passwords insecurely.