ProFTPD is a secure FTP server with a focus on configurability. Unlike vsftpd and Pure-FTPd, ProFTPD's priority is exposing a large amount of configuration options to users. Users who want more configurability than other FTP servers allow should install and run ProFTPD. System administrators familiar with Apache Web server configuration should feel right at home with ProFTPD, which was inspired by the Apache HTTP server.
ProFTPD has a single configuration file containing its many options, which aren't split up and divided among many files. It also supports ".ftpaccess" files for per-directory permissions, similar to the Apache Web server's ".httpaccess" files. ProFTPD can be extended with "modules" for encryption, other authentication methods and more.
Pure-FTPd is free, GPL-licensed software. Install Pure-FTPd from your Linux distributions package manger, or download it here.