Drupal is a free and open source content management framework written in PHP. It is used as a back-end system for at least 1% of all websites worldwide ranging from personal blogs to larger corporate sites.

The rapid website assembling, the modularity and the extensible architecture of Drupal provide an ideal ground to develop powerful web apps. Drupal has a thriving community behind it and the framework provides very powerful tools for customisation. It has zero software acquisition cost, it runs on industry standard LAMP stack and it has a proven security record.