Typo3 is an established enterprise grade CMS built on PHP. In the past years they have struggled in their renewal project, but have since moved forward with Symfony components.
TYPO3 is a comprehensive Content Management System with a long history. Development started in 1998 and the tool especially popular in German speaking countries. The tool has a wide array of features.b
TYPO3 struggled in their renewal project with confusing efforts with a custom framework (Flow) and alternative modernisation efforts like Bartacus on Symfony2. Since that development the situation has been clarified and the TYPO3 is now the main project which is moving forward with modernising the application with Symfony components.
With renewed vitality the project is pushing forward with a radical, but controlled, modernisation of their feature rich content management platform with Symfony Components.