Open source data binding framework for Java with support for XML, SQL, LDAP, and JDO.

eXist is an Open Source repository and retrieval engine for XML documents.

SGML/XML-savy structured fulltext engine and multi-protocol information management system. (BSn)

Lore is a database management system (DBMS) for XML. The Lore executables are available for public use.

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.