Userscripts.org Originally as an excuse to play with RubyOnRails, Userscripts.org has become the definitive repository for Greasemonkey scripts. Released under the GPL, you can check out the source and contribute at our Project Page“

Acts As Administered Authentication AAAA is is an authentication (login) plugin for RubyOnRails modeled for controlled user administration. When you install the plugin you are provided with a default Admin user, who can then add, edit, and delete users to the system.

This was based on and Rick Olson’s fantastic Acts as Authenticated, which was modeled for public registration.