Agile UI is a stand-alone framework that implements all the necessary components to build fully-featured and interractive user interface for your PHP application. Developed by Agile Technologies
License: Open Source
Ruby on Rails is a full-featured web application framework that emphasizes convention over configuration, making it ideal for rapid development. Agile Toolkit, on the other hand, is a lightweight and flexible framework that is easier for beginners and focuses on performance, but may not have the same level of community support or resources.