Pure-FTPd is a free (BSD), secure, production-quality and
standard-conformant FTP server. It doesn't provide useless bells
and whistles, but focuses on efficiency and ease of use. It provides
simple answers to common needs, plus unique useful features for personal
users as well as hosting providers.

You can enable optional (not-autodetected) features by passing variables 
to the script (VAR=yes/no ./pure-ftpd.SlackBuild):
MYSQL=yes|no (default: no), requires mysql (available in Slackware)
PGSQL=yes|no (default: no), requires postgresql
TLS=yes|no (default: no), requires openssl (available in Slackware)
LANGUAGE=english|german|french ... (default: english, 
see http://download.pureftpd.org/pub/pure-ftpd/doc/README for a complete
list)

If you want to start the pure-ftpd daemon at boot, add this
to /etc/rc.d/rc.local

  # Start pure-ftpd:
  if [ -x /etc/rc.d/rc.pure-ftpd ]; then
    /etc/rc.d/rc.pure-ftpd start
  fi

to stop it at shutdown add the same lines, changing "start" with "stop",
to /etc/rc.d/rc.local_shutdown