Firebase is a Google-backed application development software that enables developers to develop iOS, Android and Web apps.
Internet Information Services (IIS) is an extensible web server software created by Microsoft for use with the Windows NT family.
Leaflet is the open-source JavaScript library for mobile-friendly interactive maps.
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.