cdnjs is a free distributed JS library delivery service.
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.
Typekit is an online service which offers a subscription library of fonts.