Drupal is a free and open-source web content management framework.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Imperva is a cyber security software and services company for networking, data, and application security.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Transistor.fm is a podcast host, distribution and management platform.
Varnish is a reverse caching proxy.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.