There's Liferay: https://www.liferay.com/resources/l/content-management-system https://www.liferay.com/resources/l/content-management-syste... https://hub.doc

There's Liferay: https://www.liferay.com/resources/l/content-management-system https://www.liferay.com/resources/l/content-management-syste... https://hub.docker.com/r/liferay/portal https://hub.docker.com/r/liferay/portal I haven't played with it in about 5 years but it was substantially less polished than a well-run Sharepoint 2013 instance.