Tamino
A native XML database that stores information without converting it into other data structures; regarded not only as a database but an XML platform for electronic business. Supported by third-party XML tools and its own middleware.

GoXML
GoXML by XML Global has good XQuery support, provides EDI through XML, and supports many useful transport protocols.

Ipedo
Native XML database and cache engines for portal, intranet, b2b, e-commerce, and wireless services

NeoCore
Transactional and schema-independent XML database that uses patented pattern-processing technology to manage XML natively.

Xyleme
Dynamic data warehouse that is an indexed XML repository capable of answering queries from applications and users.

Infonyte
XML database built on a PDOM and a XQL engine.

X-Hive/DB
XML Database in form of a Java-based persistent DOM implementation.

OpenLink Virtuoso
A cross-platform, Internet data integration server, implementing native XML storage, web, file, and database server functionality and universal data access middleware as a single server solution.

SODA Technologies
SODA is a native XML database system, supporting Unicode, transaction processing, and ODBC connectivity.

MindSuite 2.0 XDB
Native XML database. The site contains information about the product as well as documentation and example code.

TEXTML
native XML database server for content search and retrieval, supports WAP