Apache is a free and open-source cross-platform web server software.
D3.js is a JavaScript library for producing dynamic, interactive data visualisations in web browsers.
Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.
PHP is a general-purpose scripting language used for web development.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.