Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Mayan EDMS - Document management without the headaches.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Alfresco Community Edition - This page explains where to access the various versions of Alfresco. For General Use Alfresco Community Edition Alfresco Community Edition provides
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Nuxeo - Nuxeo provides a hyperscale digital asset platform, enabling organizations to unlock the full value of all enterprise digital assets.