Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Tippy.js is the complete tooltip, popover, dropdown, and menu solution for the web, powered by Popper.
Typekit is an online service which offers a subscription library of fonts.
Unpkg is a content delivery network for everything on npm.