Codalogic LMX: XML Schema to C++ binding compiler
- Easy-to-use tool for compiling XML schema into C++ classes.
- http://www.codalogic.com/lmx/

Sun Multi-Schema XML Validator (MSV)
- Java tool to validate XML documents against several kinds of XML schemata. It supports RELAX NG, RELAX Namespace, RELAX Core, TREX, XML DTDs, and most of XML Schema.
- https://msv.dev.java.net/

CortexML
- Schema management software that provides support for XML versioning, XML Evolution Management (XEM) and centralized schema control.
- http://www.ignitexml.com/wildfire/

DTD and Schema Validator
- Online validator for checking a W3C XML DTD or schema for conformance to current specifications.
- http://www.validome.org/grammar/

Bluetetra XsdDoc
- Transforms XML Schema files into cross-referenced, hyperlinked HTML documents and provides a detailed functional report for each schema component.
- http://www.bluetetra.com/xsddoc/index.htm

xnsdoc XML Schema Documentation Generator
- Generates XML Schema documentation in a JavaDoc like visualization.
- http://www.buldocs.com/xnsdoc/

XML Schema validator
- Validates XML documents such as XHTML against the appropriate schemas.
- http://schneegans.de/sv/

CodeSynthesis XSD
- Details of the open-source, cross-platform W3C XML Schema to C++ data binding compiler.
- http://codesynthesis.com/products/xsd/

XMLobjective
- An XML Schema and XML/XSLT editor. Binding classes generation for XML Schema is supported in C++, Java and RDBs.
- http://www.xmlobjective.com

Stylus Studio XML Schema Tools
- Tools for visual XML schema editing, conversion, validation, schema documentation generation and XML schema mapping.
- http://www.stylusstudio.com/xml_schema.html

dtd2xs
- Free tool to translate a DTD into a W3C XML Schema
- http://www.lumrix.net/dtd2xs.php

OSS Nokalva XSD Tools
- Binds XSD schemas to C/C++ representations; produces XML and binary encodings based on X.694; and validates XSD schemas and XML instances
- http://www.oss.com/xml/products/xml.html

XML Validation
- Web-based XML validator that produces easy to read error messages and asks for missing files (e. g., XSD) if necessary.
- http://xmlvalidation.com

XBinder
- An XML Schema to C/C++ data binding tool
- http://www.obj-sys.com/products_xbinder.shtml

Pedro
- Dynamic form generation, XML Schema, data validation, controlled vocabulary services.
- http://pedrodownload.man.ac.uk/

XML Schema Quality Checker
- Alphaworks software that takes as input an XML Schema written in the W3C XML schema language and diagnoses improper uses of the schema language
- http://www.alphaworks.ibm.com/tech/xmlsqc

XSV: W3C Validator for XML Schema
- Web form for checking a schema which is accessible via the Web, and/or schema-validating an instance with a schema of your own.
- http://www.w3.org/2001/03/webdata/xsv