cdnjs is a free distributed JS library delivery service.
Emotion is a library designed for writing CSS styles with JavaScript.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Recurly provides enterprise-class subscription billing and recurring payment management for thousands of businesses worldwide.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
Vercel is a cloud platform for static frontends and serverless functions.
Vue.js is an open-source model–view–viewmodel JavaScript framework for building user interfaces and single-page applications.