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I'm looking for a free alternative to Stylus Studio which is a visual XML editing tool.
Here are my requirements:
I've already tried XML copy editor, but it does not work for me
I think that XmlSpy or Liquid XML Studio accomplishes the requisites, but I'm not sure about the multi-XSD. However, the applications I mentioned are paid products.
I think you should consider that it could be an impossible task to find a free open-source application that accomplishes all those requisites you need.
Anyways, here below is a table from Wikipedia that compares a lot of free and paid XML IDEs, it mentions/compares some of the requisites you need.
If a freeware solution exists, it should be in this list.
https://en.wikipedia.org/wiki/Comparison_of_XML_editors
You can use the XMLmind XML Editor. Here is how it compares to your requirements:
free: yes, as in "gratis"; it is free for personal use and to work on open source projects (see), but it is not open source software itself
cross-platform: yes – Windows, MacOS, Linux and anything running OpenJDK 14
tree view of XML: yes, under "View → XML source"
visual blocks view: yes, when using it together with a stylesheet; try the Docbook example that comes with the editor
create XML snippets from XSD: not yet tested
Xpath query support: not yet tested
