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(Enterprise) Content Management Systems:
ECMs seem to be more complete systems (with a web UI) for managing documents on-line. (Think of Google blogspot.) So this line of exploration may be a dead-end.
OpenCMS an open source content management system written in Java http://demo.opencms.org/en/ "enterprise content management"
Nuxeo is a comprehensive free software/open source Enterprise Content Management (ECM) platform http://en.wikipedia.org/wiki/Enterprise_content_management
dotCMS dotCMS is a free software / open source web content management system (wCMS)
Alfresco an open source enterprise content management system
Magnolia (CMS) is an Open-Source content management system (CMS) developed by Magnolia International Ltd., based in Basel, Switzerland uses jackrabbit under the hood
Hippo CMS ...for multi-channel distribution like web sites and intranets. uses jackrabbit under the hood
Apache Lenya Apache Lenya is a Java/XML open-source content management system based on the Apache Cocoon content management framework. Features include revision control, scheduling, search capabilities, workflow support, and browser-based WYSIWYG editors.