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.
Open Graph is a protocol that is used to integrate any web page into the social graph.
WildJar is a call tracking and intelligence platform which helps you understand where your leads are coming from, who is calling you, what your conversations are about and connect that data into other platforms.