Apache is a free and open-source cross-platform web server software.
Cloudrexx is a proprietary content management system that provides customisable templates and built-in modules for managing content, ecommerce, events, newsletters, and more, along with tools for SEO, social media integration, and multilingual support.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.