The technology behind this site
1. Application software
The entire site is built with PHP 5.3+, on top of Mmi Framework, and Mmi CMS. The framework and the CMS is free, and distributed under New BSD license, which is very permissive and imposing minimal restrictions on the redistribution of covered software.
Mmi was originally besed on Zend Framework, but now it only uses a few external Zend modules, like Zend_Mail or Zend_Soap. By removing Zend, and building our own application flow, we gain performance and simplicity.
2. Server software
For a very long time we've been using nginx + php-fpm, and several different database engines, this site specifically uses SQLite3. The server operating system is a standard linux distribuition (Debian).