Apache is a free and open-source cross-platform web server software.
Debian is a Linux software which is a free open-source software.
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.
Gravitec is a push notification tool.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.
Smart Ad Server is an adserving and RTB platform.
Varnish is a reverse caching proxy.