https://sourceforge.net/projects/exoops/

https://www.drupal.org/

Launch, manage and scale ambitious digital experiences—with the flexibility to build great websites or push beyond the browser. Proudly open source.

https://contao.org/en/

Accessible Open Source Content Management System

https://compo.sr/start.htm

Composr is a very flexible CMS with advanced social, interactive and dynamic functionality.

https://sourceforge.net/projects/chicomas/