cdnjs is a free distributed JS library delivery service.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Popper is a positioning engine, its purpose is to calculate the position of an element to make it possible to position it near a given reference element.
SPIP is a content management system written in PHP that uses one or more databases like SQL, SQLite or PostgreSQL.