BEM (Block, Element, Modifier) is a naming convention for classes in HTML and CSS what was developed by Yandex.
ClustrMaps widget is a visitor tracker, designed for general web and blog use.
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.
LiteSpeed is a high-scalability web server.
PHP is a general-purpose scripting language used for web development.