cdnjs is a free distributed JS library delivery service.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
Svelte is a free and open-source front end compiler created by Rich Harris and maintained by the Svelte core team members.