Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Google PageSpeed is a family of tools designed to help websites performance optimisations.
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.
React is an open-source JavaScript library for building user interfaces or UI components.