Birdstep RDM XML: Provides a native XML data structure with a rich set of features for database applications found in handheld devices, Internet appliances and embedded systems.
DbcDOM: XML library for DATABUS language. There are basic functions for export/import XML files. Contains additional classes for LinkedLists, Stacks, and Exceptions.
Natix: Native XML database for Linux.
XML and Databases: Discusses the relationship between XML and databases. Describes some of the types of software available to process XML documents with databases.