passwdqc is a password/passphrase strength checking and policy enforcement toolset, including an optional PAM module (pam_passwdqc), command-line programs (pwqcheck and pwqgen), and a library (libpasswdqc).
Please feel free to add to the list above, as well as to the one below. External links are OK, but except for links to packages it is preferred that you create new pages right on this wiki, under the passwdqc DokuWiki namespace - e.g., there could be a page with instructions on setting up passwdqc on HP-UX (it does not exist yet). To edit this wiki, you need to register for an account and log in, then use the “Edit this page” (when on an existing page) and “Create this page” (when on an URL for a page that does not exist yet) buttons at the bottom. You may also use the “Subscribe Changes” button to be notified (by e-mail) of any changes to the wiki page you're on.
These are third-party and unofficial:
Additionally, passwdqc 1.3.0+ includes an official PHP wrapper script pwqcheck.php for the command-line pwqcheck program.