cdnjs is a free distributed JS library delivery service.
Cosmic is a cloud-based CMS that provides developers with an API and web interface for content management, enabling the creation of custom content types, relationship definitions, and webhooks for actions based on content changes.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Materialize CSS is a front-end framework that helps developers create responsive and mobile-first web applications. It is based on Google's Material Design guidelines.
Netlify providers hosting and server-less backend services for web applications and static websites.