Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Plone is a free and open source content management system (CMS) built on top of the Zope application server.
RequireJS is a JavaScript library and file loader which manages the dependencies between JavaScript files and in modular programming.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.
Varnish is a reverse caching proxy.