Calendly is an app for scheduling appointments, meetings, and events.
Cookiebot is a cloud-driven solution that automatically controls cookies and trackers, enabling full GDPR/ePrivacy and CCPA compliance for websites.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.