http://www.opencms.org/opencms/en/

OpenCms - Professional Content Management Easy to Use, Open Source, Reliable

http://www.cromoteca.com/en/meshcms/

https://sourceforge.net/projects/lportal/

The world's leading open source portal

https://github.com/florinpatrascu/jpublish

JPublish provides a powerful system for managing your web site's content as well as your web site's application logic.

http://www.jease.org/

Jease is an Open Source Content-Management-System which is driven by the power of Java. Jease means "Java with Ease", so Jease promises to keep simple things simple and the hard things (j)easy.

https://www.jahia.com/home/en

The Only True DXP

Jahia is the only Digital Experience Platform (DXP) that brings content + customer data together so you can deliver engaging, personalized experiences faster.

http://ion-cms.sourceforge.net/section/s0.html

ion is an open source content management system using J2EE and XML technologies.

https://documentation.bloomreach.com/

https://sourceforge.net/projects/openharmonise/

https://wiki.lyrasis.org/display/FF