(short for Pro FTP daemon) is a free and open source FTP server
ProFTPD is compatible with Unix-like systems and Microsoft Windows (via Cygwin). Along with vsftpd and Pure-FTPd, ProFTPD is among the most popular FTP servers in UNIX-like environments today.
Compared to those, which focus e.g. on simplicity, speed or security, ProFTPD's primary design goal is to be a highly feature rich FTP server, exposing a large amount of configuration options to the user. ProFTPD grew out of the desire to have a secure and configurable FTP server, at a time where the most common FTP server was wu-ftpd, which was not very feature rich and had a poor security history.