Apache is a free and open-source cross-platform web server software.
CakePHP is an open-source web framework. It follows the model–view–controller (MVC) approach and is written in PHP.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.