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

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

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

WordPress is a free and open source blogging tool and content management system (CMS) powered by PHP and MySQL. It has many features including a plug-in architecture and a template system. wikipedia.org

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

Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. It is intended as a fast, easier-to-administer, and secure alternative to the widely-used Sendmail MTA.

An application programming interface (API) is a source code based specification intended to be used as an interface by software components to communicate with each other. An API may include specifications for routines, data structures, object classes, and variables. wikipedia.org

Crystal Reports is a business intelligence application used to design and generate reports from a wide range of data sources. Several other applications, including Microsoft Visual Studio, at one time bundled an OEM version of Crystal Reports as a general purpose reporting tool. wikipedia.org

jQuery is a cross-browser JavaScript library designed to simplify the client-side scripting of HTML. Its syntax is designed to make it easier to navigate a document, select DOM elements, create animations, handle events, and develop Ajax applications. wikipedia.org

Data scraping is a technique in which a computer program extracts data from human-readable output coming from another program. 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.