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Active Admin
Active Admin allows you to quickly build an admin interface with just a few commands. Not only does it look great, but it is very customizable as shown in this episode.
(12 minutes)
restful_authentication
Need multiple user authentication? If so, the restful_authentication plugin is a great way to go. It will generate some basic authentication code for you which is good starting point to your authentication system. Watch this episode for details.
(9 minutes)