PostgreSQL is a powerful, open source object-relational database system that uses and extends the SQL language combined with many features that safely store.
MariaDB Server is one of the most popular open source relational databases. It’s made by the original developers of MySQL and guaranteed to stay open source.
The Apache HTTP Server Project an open-source HTTP server for modern operating systems including UNIX and Windows. It is robust, commercial-grade, feature-rich.
Nginx [engine x] is an HTTP and reverse proxy server, a mail proxy server, and load balancer. Nginx is free and open-source software.
Caddy is open source ultimate web server. It's the only web server to use HTTPS automatically & by default and written in Go. It simplifies your infrastructure.