XMLSpy Enterprise Edition 

Altova XMLSpy 2006 Enterprise Edition is the industry standard XML development environment for modeling, editing, debugging and transforming all XML-related technologies, then automatically generating runtime code in multiple programming languages.
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XMLSpy Professional Edition 

Altova XMLSpy 2006 Professional Edition is the industry leading XML development environment, providing intuitive editing views and powerful XML utilities to model, edit, transform, and debug XML technologies quickly and easily.
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XMLSpy Home Edition 

Altova XMLSpy 2006 Home Edition is a totally FREE entry level XML development tool for designing and editing XML applications. XMLSpy Home Edition supports Eclipse integration and is ideally suited for hobbyists, entry level developers, and students.
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