Drupal Multisite enables separate, independent sites to be served from a single codebase.
Drupal is a free and open-source web content management framework.
LiteSpeed Cache is an all-in-one site acceleration plugin for WordPress.
LiteSpeed is a high-scalability web server.
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.
PHP is a general-purpose scripting language used for web development.