Pimcore is a CMS whose development started in 2009. Originally the Content Management System was built on the Zend PHP Framework, but the system will switch to the Symfony full stack framework.
In a move announced in March 2017 Pimcore is moving to take advantage of the full stack Symfony framework. The current goal is to move the already established 4.x series to a new generation with Pimcore 5.0, with a launch expected in October 2017.
Pimcore is a true enterprise CMS in the sense that it also comes not with only advanced multisite and multilanguage features, but also reaches to building Digital Experiences with personalization features.