Apps similar to XSDHub include Altova XMLSpy. It's paid, but Mustang Project is free. Other options are Oxygen XML Editor. In total there are three XML Editors like XSDHub for Windows, Linux and Mac.
Altova XMLSpy is the industry's best-selling XML editor and development environment for modeling, editing, transforming, and debugging XML-related technologies. It offers the world’s leading graphical schema designer, a code generator, file converters, debuggers, profilers...
Austria
EU
Mustangproject is a open source library and command line tool for FacturX/ZUGFeRD, a PDF-based format for electronic invoices.
Oxygen XML Editor is a cross platform XML Editor providing tools for XML authoring, XML conversion, XSL, XSLT, XQuery, XML Schema, DTD, Relax NG and Schematron development, SOAP and WSDL.
RomaniaEU
