Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Drupal is a free and open-source web content management framework.
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.
Unpkg is a content delivery network for everything on npm.