administration style interfaces

Active Admin is a Ruby on Rails plugin for generating administration style interfaces. It abstracts common business application patterns to make it simple for developers to implement beautiful and elegant interfaces with very little effort.
Active Admin’s interface was designed from the ground up for non-technical users. It makes it easy for developers to build highly usable interfaces that customers will actually enjoy using. You can get started with one line of code or customize the entire interface with the provided DSL.

Requirements: Ruby on Rails
Demo: http://activeadmin.info/
License: License Free