PAM-modules is a collection of some useful PAM modules and a command line utility for checking PAM authentication and other management groups.

pam_fshadow
Authentication against an alternative shadow file.
pam_regex
Controls user access by matching their login name against a regular expression and allows to alter user names.
pam_log
A diagnostic tool that formats and outputs given messages using syslog.
pam_mysql
Authentication using a MySQL database.
pam_pgsql
Authentication using a PostgreSQL database.
pamck
A command line utility for testing PAM stacks.