Drupal is an open source and free online Content Management System. As an estimate, 1.5% of all the Websites worldwide use Drupal as their backend portal. It is the second choice of bloggers after Wordpress. Drupal Core has some basic features, i.e. overall common features of all the content management systems. The Drupal users have to add the modules to customize the core and get the additional functionalities. Drupal is a hardcore technical CMS but its modules help everyone to perform the required task without much headache. This fact also applies for the SEO work. Our experts have categorized following must-have modules to do an effective SEO of a Website running on Drupal.