Apache is a free and open-source cross-platform web server software.
Blitz provides intelligent static page caching for creating lightning-fast sites with Craft CMS.
Craft CMS is a content management system for building bespoke websites.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Open Graph is a protocol that is used to integrate any web page into the social graph.