Apache is a free and open-source cross-platform web server software.
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.
SPIP is a content management system written in PHP that uses one or more databases like SQL, SQLite or PostgreSQL.
Varnish is a reverse caching proxy.