Drupal is another Content Management System which is also very popular and used to develop web sites which require a large amount of interactivity like forums and blogs. In fact Drupal has built in Forum, Blog as well as Comment modules as optional Core Modules which makes it an ideal option for development of your forum or blog.
   Drupal allows the greatest degree of customisation among the popular content management system as PHP code can also be entered along with HTML in the required web pages.