Drupal is a free and open-source web content management framework.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
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.
Qualified is a B2B marketer that allows buyers and sales reps to connect through real-time website conversations.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.
Varnish is a reverse caching proxy.