cdnjs is a free distributed JS library delivery service.
Google Analytics is a free web analytics service that tracks and reports website traffic.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
Wistia is designed exclusively to serve companies using video on their websites for marketing, support, and sales.