cdnjs is a free distributed JS library delivery service.
Font Awesome is a font and icon toolkit based on CSS and Less.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Google Maps is a web mapping service. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets, real-time traffic conditions, and route planning for traveling by foot, car, bicycle and air, or public transportation.
OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.