Definition. A free enterprise CMS written in PHP with a long LTS history. TYPO3 natively supports multisite, multi-language, workspaces, frontend and backend permission models, an extension API and structured content via Content Blocks. It is maintained under the GPL licence by an active community and the TYPO3 Association.

Why it matters. For mid-sized platforms that have to manage several domains, several editorial teams and compliance requirements together, TYPO3 is one of the few open source options that covers this without custom development.

Related. TYPO3 Extension, TYPO3 Kubernetes, Enterprise CMS, Headless CMS, Open Source CMS