jystewart

Many people use wordpress to run blogs alongside their Ruby on Rails applications. And many 
Ruby on Rails applications use very similar login systems, derived from the restful_authentication 
or clearance plugins. This plugin provides hooks so that your wordpress blog can read your rails 
app’s database.yml file, connect to that database and authenticate the user against your rails app.
This plugin requires the syck PHP extension for parsing yaml. Instructions for installing syck are available at 
http://trac.symfony-project.org/wiki/InstallingSyck
<h3>To Do</h3>
<ul>
<li>Add automated tests</li>
<li>Solicit user feedback on further options</li>
</ul>

WP Rails Authenticate

Log users in against their accounts in a Ruby on Rails application.

niksudan

This plugin allows administrators to create additional login details (username and password) for a registered user account. It restricts the additional logins from accessing their linked user’s profile page, as well as accessing the additional logins panel themselves.
The additional logins can be turned off at any time, preventing users from using the credentials to sign in. Descriptions can be given to logins that you create. Additional login usernames are treated like normal WordPress usernames, and cannot match an existing login. Likewise, new logins cannot have the same username as an additional login.
Useful for when wanting to have a few pairs of login details without giving away the main account’s password, as well as multiple team members, or just for convenience.
View it on GitHub: https://github.com/NikSudan/wp-additional-logins

WP Rails Authenticate vs WordPress Additional Logins