Concrete CMS

Concrete CMS is an open-source content management system (CMS) primarily used for building websites. While not specifically designed for advertising, it`s a flexible platform that can be used to create landing pages, manage campaigns, and track results. Its user-friendly interface and extensive plugin library make it suitable for businesses of all sizes. Concrete CMS offers a free, open-source version as well as paid enterprise plans.

Website: https://www.concrete5.org/