Apache is a free and open-source cross-platform web server software.
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.
PHP is a general-purpose scripting language used for web development.
Semantic UI is a front-end development framework, powered by LESS and jQuery.
SPIP is a content management system written in PHP that uses one or more databases like SQL, SQLite or PostgreSQL.