Symfony 4 was released on November 30th.
Update now to the best Symfony ever!

OroPlatform

The OroPlatform is an Open source Business Application Platform (BAP). It offers developers the exact business application platform they've been looking for, by combining the tools they need. Built in PHP and the Symfony framework, it seamlessly integrates into OroCRM and OroCommerce or works entirely standalone. Developing custom business applications has never been so easy.