Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.
Yaws (Yet Another Web Server) is an open-source web server designed to deliver dynamic content efficiently. It was developed by Claes (klacke) Wikström and is written in Erlang, a functional programming language.