Drupal is open source software maintained and developed by a community of hundreds of thousands of users and developers around the world. It's distributed under the terms of the GNU General Public License (or "GPL"?), which means anyone is free to download it and share it with others. Drupal is open source software maintained and developed by a community of 630,000+ users and developers. It's distributed under the terms of the GNU General Public License (or "GPL"?), which means anyone is free to download it and share it with others.