cdnjs is a free distributed JS library delivery service.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Nuxt is a Vue framework for developing modern web applications.
Optimizely is an experimentation platform that helps developers build and run A/B tests on websites.
Typekit is an online service which offers a subscription library of fonts.
Vue.js is an open-source model–view–viewmodel JavaScript framework for building user interfaces and single-page applications.