Drupal is a free and open-source web content management framework.
Firebase is a Google-backed application development software that enables developers to develop iOS, Android and Web apps.
Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
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.