Symfony is a web application framework for PHP projects. It aims to speed up the creation and maintenance of web applications, and to replace the repetitive coding tasks by power, control and pleasure. Symfony is aimed at building robust applications in an enterprise context. This means that you have full control over the configuration: from the directory structure to the foreign libraries, almost everything can be customized. To match your enterprise's development guidelines, symfony is bundled with additional tools helping you to test, debug and document your project.
Symfony is not an ORM Framework, but makes great use of Propel and Doctrine frameworks and ORM Designer comes with support of Symfony directory structure and plugins.