HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Ibexa DXP is an open-source enterprise PHP content management system (CMS) and Digital Experience Platform (DXP) developed by the company Ibexa (known previously as eZ Systems).
Open Graph is a protocol that is used to integrate any web page into the social graph.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Varnish is a reverse caching proxy.