Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.
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.