Drupal is a content management framework that Lullabot uses to build high-performance Web sites on top of this infrastructure. Drupal is built with PHP as its primary programming language and has a ton of user-contributed modules freely available to extend its functionality. It has been compared to LEGOs because of this, and because the quality of modules vary, it’s a good idea to do full code reviews of any modules that are selected for inclusion into any platform build.