Core ProFTPD Modules (modules/ subdirectory)
Modules always included:

• mod_auth
  Implements FTP authentication commands (USER, PASS, ACCT, REIN).

• mod_core
  Implements core configuration directives and most RFC-959 FTP commands (CWD, CDUP, MKD, PWD, RMD, DELE, RNTO, RNFR, PASV, PORT, SYST, HELP, QUIT, NOOP), and the MDTM and SIZE extensions.

• mod_log
  Interface to Unix message logging (syslog or file).

• mod_ls
  Implements the FTP LIST, NLST and STAT commands.

• mod_site
  Implements the FTP SITE command, and the HELP and CHMOD subcommands.

• mod_unixpw
  Interface to the native Unix password system.

• mod_xfer
  Implements FTP file transfer commands (STOR, RETR, APPE, REST, ABOR, TYPE, STRU, MODE, ALLO, SMNT, STOU).

Modules automatically included when supported by the OS:

• mod_pam
  PAM (Pluggable Authentication Modules) authentication.
  See README.PAM.
  Originally contributed by MacGyver <macgyver@tos.net>.

Optional modules:

• mod_readme
  Display "readme" files, controlled by the DisplayReadme directive.
  See the comments in contrib/mod_readme.c.
  Originally contributed by <jan.menzel@gmx.de>

Contributed ProFTPD Modules (contrib/ subdirectory)
Also, see contrib/README.

Authentication modules:

• mod_ldap
  LDAP (Light-weight Directory Access Protocol) authentication.
  See README.LDAP.
  Contributed by John Morrissey >jwm@horde.net>.

• mod_sql, mod_sql_mysql, mod_sql_postgres
  (formerly known as mod_sqlpw, mod_mysql, mod_pgsql)
  SQL (Structured Query Language) database authentication and other functions, with backends for MySQL and PostgreSQL.
  See README.mod_sql.
  Contributed by Johnie Ingram <johnie@netgod.net>.
  Maintained by Andrew Houghton <aah@acm.org>.

Feature modules:

• mod_linuxprivs, libcap
  POSIX 1e (IEEE 1003.1e draft) security model enhancements (capabilities and capability sets), available for Linux kernels 2.1.104 and later.
  See README.linux-privs.

• mod_quota
  Directory tree based disk quotas.
  Contributed by Eric Estabrooks <eric@urbanrage.com>.

• mod_ratio
  User upload/download ratios.
  See contrib/README.ratio and the comments in mod_ratio.c.
  Contributed by Johnie Ingram <johnie@netgod.net>
  and Jim Dogopoulos <jd@dynw.com>/<jd@downcity.net>.

• mod_wrap
  TCP Wrappers.
  See contrib/README.mod_wrap and contrib/mod_wrap.html.
  Contributed by TJ Saunders <tj@castaglia.org>.

Note that the mod_test module is non-functional. Do not attempt to compile or use it.

Other ProFTPD modules (not included in the source distribution)
These modules (and patches) are neither evaluated nor sanctioned in any way. Draw no implication based on inclusion or non-inclusion in this list.

A more complete and current list may be found on the web site:

        http://www.proftpd.org/docs/
        http://www.proftpd.org/links.html

Authentication modules:

• mod_dbauth
  Berkeley DB 1.x authentication.
  ftp://pooh.urbanrage.com/pub/c/
  Eric Estabrooks <eric@urbanrage.com>

• mod_pwcheck
  Checks anonymous passwords and connections.
  ftp://ftp.eos.hokudai.ac.jp/pub/pck/release/
  Akihiko Yamamoto <star@eos.hokudai.ac.jp>

• mod_opie
  OPIE (One-time Passwords In Everything) authentication.
  ftp://pooh.urbanrage.com/pub/c/
  Eric Estabrooks <eric@urbanrage.com>