This is a broad overview of the achitecture behind this website, and credits and appreciation for the several open source tools used. Briefly, it runs on a Drupal CMS, served by nginx and varnish.
The webiste is rendered and managed by Drupal content management system, which is an extensive and modular php + MySql based framework. It runs off an Ubuntu server, based on the debian GNU/Linux operating system. The public face of the website is served by varnish cache, which has its backend served by nginx, monitored by munin, and load tested with apache jMeter.