JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
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.