Chad Butler

This plugin is a password generator that creates random passwords with using words, numbers, and special characters.
Default random passwords can be difficult to for users to use (and remember – if they don’t change it). WordPass simplifies this process by using words to create passwords. Passwords will be generated in the style of 2*Kayak29, 2Bigcranium2#, or %36POTATOE6.
This plugin works with WordPress as well as with any plugin that uses the WordPress password generation function.
WordPass allows you to create a custom list of words to be used in password generation.
The plugin will create random passwords from your word list and apply numbers as well as capitalization. How these settings are applied can be set in the plugin’s settings. The recommended setting is “random” for best security.
Note: this plugin is great for membership sites where subscribers or low level users need easy to remember passwords. But you should use secure (and possibly more complex) passwords for higher level users, especially administrators. Use common sense in the application of this plugin!

WordPass

Creates word-based passwords for WordPress.

onelogin

This SAML plugin eliminates passwords and allows you to authenticate WordPress users (typically editors) against your existing Active Directory or LDAP server as well increase security using YubiKeys or VeriSign VIP Access via OneLogin. OneLogin is pre-integrated with thousands of apps and handles all of your SSO needs in the cloud and behind the firewall.
<ul>
<li>Eliminate passwords in WordPress</li>
<li>Allow users to sign into WordPress with their Active Directory or LDAP credentials</li>
<li>Give users one-click access from your intranet</li>
<li>Increase security using browser PKI certificates or two-factor authentication from Yubico or VeriSign</li>
<li>Easily prevent access from former employees and contractors</li>
</ul>
If you used this plugin before 2.2.0 with just-in-time provision active, Read: https://wpvulndb.com/vulnerabilities/8508 
To mitigate that bug, place the script at the root of wordpress and execute it (later remove it) https://gist.github.com/pitbulk/a8223c90a3534e9a7d5e0a93009a094f

OneLogin SAML SSO

This plugin provides single sign-on via SAML and gives users one-click access to their WordPress accounts from identity providers like OneLogin.

WordPass vs OneLogin SAML SSO