What are some alternatives?
When comparing FileZilla Server and ProFTPD, you can also consider the following products
vsftpd - Very secure FTP Daemon, a secure, fast FTP server for UNIX systems, including Linux.
Serv-U FTP Server - FTP server software
Titan FTP Server - Windows FTP Server with SFTP and SSL. Includes events automation.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows
Baby FTP Server - The simplest FTP server to setup. No authentication required.
Gene6 FTP Server - Gene6 FTP Server is an advanced FTP server software for Windows developed specifically for security...