cdnjs is a free distributed JS library delivery service.
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.
Semantic UI is a front-end development framework, powered by LESS and jQuery.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.