Capistrano tasks for deploying the Symfony standard edition
The Symfony Installer
Give thanks (in the form of a GitHub ★) to your fellow PHP package maintainers (not limited to Symfony components)!
Symfony e-commerce bundle for professional, ultra fast online shops, complex B2B applications and #gigacommerce
A browser testing and web crawling library for PHP and Symfony
FOSUserBundle is certainly the most popular bundle for Symfony to manage users.
Symfony Demo Application