Drupal

Drupal is a powerful open-source content management system (CMS) often used for website development. While Drupal itself isn`t specifically an advertising product or company, its flexible architecture allows for integration with various advertising tools and platforms. This means Drupal websites can easily implement display advertising, retargeting, and other marketing strategies. Additionally, there are Drupal modules specifically designed for managing advertising campaigns, providing features like ad tracking and reporting.

Website: https://www.drupal.org