HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Integral Ad Science is an American publicly owned technology company that analyses the value of digital advertising placements.
Leaflet is the open-source JavaScript library for mobile-friendly interactive maps.
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.