TYPO3 is an open-source, enterprise-level content management system written in PHP. It allows for the creation and management of complex, multilingual websites with advanced features such as versioning, workflow management, and integrations with other systems.
Contao is a free and open-source content management system (CMS) written in PHP that allows for the creation and management of websites. It offers features such as customizable templates, SEO optimization, and a flexible architecture for developers to create custom extensions.