Apache is a free and open-source cross-platform web server software.

CentOS is a Linux distribution that provides a free, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).

OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.

PHP is a general-purpose scripting language used for web development.

jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.

vBulletin is tool that is used to create and manage online forums or discussion boards. It is written in PHP and uses a MySQL database server.

Lightbox is small javascript library used to overlay images on top of the current page.

Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.