ProFTPD -- Professional FTP Server.

ProFTPD is an enhanced FTP server with a focus toward simplicity, security,
and ease of configuration.  It features a very Apache-like configuration
syntax, and a highly customizable server infrastructure, including support for
multiple 'virtual' FTP servers, anonymous FTP, and permission-based directory
visibility.

There are two other packages you can use to setup for inetd or standalone
operation.