Symfony is a PHP web application framework and a set of reusable PHP components/libraries. Developed by Sensio Labs
License: Open Source
Symfony is a robust and flexible framework ideal for large-scale applications with a strong emphasis on security and performance. In contrast, Agile Toolkit offers a lightweight and easy-to-use solution suitable for rapid development and small to medium applications, but lacks some of the advanced features and community support found in Symfony.