Contao is an open source CMS from Germany that can be used for websites of any size. Many functions are already included in the basic Contao package, such as multilingualism and detailed settings for user rights.
If you are missing a certain function, you can upgrade it in many cases via an extension. For example, the Notification Center extension allows you to send SMS from Contao when you integrate our service.
Users of the CMS especially appreciate the flexibility and scalability. In addition, Contao is GDPR-compliant “out-of-the-box”. An active community rounds off the attractiveness of the CMS.