Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Plausible is an open-source alternative to Google Analytics.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.