CodeSynthesis XSD 4.0.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The actual developer of the free software is Code Synthesis Tools CC. The program lies within Development Tools, more precisely IDE. The most popular versions of the software 3.3, 3.2 and 3.1.
From the developer:
CodeSynthesis XSD is an open-source, cross-platform W3C XML Schema to C data binding compiler. Provided with an XML instance specification (XML Schema), it generates C classes that represent the given vocabulary as well as parsing and serialization code.
You may want to check out more software, such as XMLFox Advance XML Editor, Liquid XML Data Binder 2008 or CoherentWeb, which might be related to CodeSynthesis XSD.