Additional
Information: freely (GPL, LGPL) and openly (BSD, Apache, X, artistic) licensed xml database systems
Free and Open Sites:
Lore Lore: Lore is a database management system (DBMS) for XML. The Lore executables are available for public use. (Free and Open) http://www-db.stanford.edu/lore/
Castor Castor: Open source data binding framework for Java with support for XML, SQL, LDAP, and JDO. (Free and Open) http://castor.exolab.org/
Xindice Xindice: DBMS written in Java to optimize the storage, retrieval, querying, and management of XML-based documents. Xindice was known as "dbXML Core" prior to joining the Apache XML Project. (Free and Open) http://xml.apache.org/xindice/
eXist eXist: eXist is an Open Source repository and retrieval engine for XML documents. (Free and Open) http://exist.sourceforge.net/
interBasis (IB 2.x) interBasis (IB 2.x): SGML/XML-savy structured fulltext engine and multi-protocol information management system. (BSn) (Free and Open) http://www.bsn.com/Z39.50/