From the docs:

Apache Lenya is an Open-Source Content Management System written in the JavaLanguage and based on open standards such as XML and XSLT. Lenya is built on top of ApacheCocoon and other components from the Apache Software Stack. Its XML-centric architecture allows for content delivery targeted to the capabilities of various devices, and avoids data lock-in. Apache Lenya is built around Off the Shelf components from the Apache Software Foundation.

Web site: http://lenya.apache.org/

Wiki page: http://wiki.apache.org/lenya/