Drupal is a free and open-source web content management framework.
iubenda is a compliance software used by businesses for their websites and apps.
Mautic is a free and open-source marketing automation tool for Content Management, Social Media, Email Marketing, and can be used for the integration of social networks, campaign management, forms, questionnaires, reports, etc.
Open Graph is a protocol that is used to integrate any web page into the social graph.