Cascading Style Sheets (CSS) is a style sheet language used to describe the presentation (that is, the look and formatting) of a document written in a markup language. wikipedia.org

Web development is a broad term for the work involved in developing a web site for the Internet (World Wide Web) or an intranet (a private network).

WebGL (Web Graphics Library) is a JavaScript API for rendering interactive 3D graphics and 2D graphics within any compatible web browser without the use of plug-ins.

PHP is a general-purpose server-side scripting language originally designed for web development to produce dynamic web pages. wikipedia.org

The Google Maps API allows developers to embed dynamic, draggable maps in their web applications. It's free for sites that are freely available to the public, and there's an enterprise version for private sites.

JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles. wikipedia.org

HyperText Markup Language (HTML) is the main markup language for web pages. HTML elements are the basic building-blocks of webpages. wikipedia.org

MySQL is (as of March 2014) the world's second most widely used open-source relational database management system (RDBMS). wikipedia.org

Three.js is a lightweight cross-browser JavaScript library/API used to create and display animated 3D computer graphics on a Web browser. Three.js uses WebGL. The source code is hosted in a repository on GitHub. wikipedia.org

A primary goal of data visualization is to communicate information clearly and efficiently to users via the information graphics selected, such as tables and charts. Effective visualization helps users in analyzing and reasoning about data and evidence. wikipedia.org