Do you need an Authorization or Authentication plugin? It seems that everyone is giving you Authentication plugin.
Authentication
To verify user with its credentials so she can get in to the system
devise is one of Authentication plugin that works well (out of the box) with Rails 3:
Authorization
To verify whether the logged in user is allowed to access certain feature in the system
Here are the list of Authorization plugin in Rails (that works well with Rails 3).
- CanCan
- Declarative Authorization
CanCan is much simpler and straight forward. Decl_auth is much cleaner and can get pretty difficult to work with at some stage. Hope that helps.