FileZilla Client (also referred to as FileZilla) is a free, open source, cross-platform FTP client. Binaries are available for Windows, Linux, and Mac OS X. It supports FTP, SFTP, and FTPS (FTP over SSL/TLS). As of 28 August 2012, it was the 7th most popular download of all time from SourceForge.net.
FileZilla Server is a sister product of FileZilla Client. It is an FTP server supported by the same project and features support for FTP and FTP over SSL/TLS.
FileZilla's source code is hosted on SourceForge.net. The project was featured as Project of the Month in November 2003.