Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.
cdnjs is a free distributed JS library delivery service.
Eloqua is a Software-as-a-Service (SaaS) platform for marketing automation offered that aims to help B2B marketers and organisations manage marketing campaigns and sales lead generation.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.