Apache is a free and open-source cross-platform web server software.
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.
MaxMind is a provider of geolocation and online fraud detection tools.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
Varnish is a reverse caching proxy.