Altova XMLSpy is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The most popular Mac alternative is 
<oXygen/> XML Editor. It's not free, so if you're looking for a free alternative, you could try 
XPontus XML Editor or 
FlexDoc/XML XSDDoc. If that doesn't suit you, our users have ranked 22 alternatives to Altova XMLSpy and nine of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Altova XMLSpy are 
Xmplify (Paid), 
XMLmind XML Editor (Paid), 
EditiX (Paid) and 
Kernow (Paid).
JSON and XML editor for modeling, editing, transforming, and debugging. If you're looking for more info about Altova XMLSpy like screenshots, reviews and comments you should visit our info page about it. Below you find the best alternatives.
Oxygen XML Editor is the complete XML editing solution, both for XML developers and content authors. It provides must have tools for XML editing, covering most XML standards and technologies. Oxygen XML Editor includes all the features of Oxygen XML Developer and Author.
MOSO Xmplify is a powerful new XML editor built specifically for Mac OS X, with DTD and XML Schema-based auto-completion, automatic document validation, XSLT and XPath support, live HTML preview and much more.
XMLmind XML Editor allows to author large, complex, modular, XML documents. It makes it easy mastering XML vocabularies such as DocBook or DITA.
EditiX is a powerful and easy to use XML editor, Visual Schema Editor, XQuery Editor and XSLT debugger for Windows, Linux and Mac OS X designed to help web authors and application programmers take advantage of the latest XML and XML-related technologies such as XSLT / FO, DocBook and XSD Schema. EditiX XML Editor now comes in two editions. EditiX Free XMLEditor Lite is free for non-commercial environments and can be downloaded without registration.
XPontus XML Editor is a simple XML Editor oriented towards text editing. It can perform validation (DTD, XML Schema, Relax NG, Batch XML validation), XSL transformations(HTML, XML, PDF, SVG), schema/DTD generation, XML/DTD/HTML/XSL code completion, code formatting and much more.
A GUI and high-level API for the Saxon XSLT, XQuery and XML Schema processor. Kernow is an open source tool designed to make it faster and easier to repeatedly run transforms using Saxon. It uses compiled stylesheets, multiple threads and caching resolvers to make the transforms run efficiently, and comboboxes that remember between runs to save your fingers having to retype paths.
High-performance universal XML Schema Documentation Generator with diagrams: * Takes on input any number of W3C XML Schema (XSD) files and generates by them a multi-file Javadoc-like HTML documentation as well as single-file HTML and RTF * Automatically loads and documents all referenced XML schemas.
The XML Assistant is a XML Editor that makes editing of XML files visual and clear. By using display rules the outlook of the XML tree is highly customizable. This makes it easy to handle the XML structure. Contents are edited using regular and customizable input fields, especially useful for XML-Data with recurring structures. Using the XML Assistant everybody can edit XML files.
Easy XML Editor treats XML files as what they are: A hierarchic composition of nodes that have subnodes and attributes. The XML data is presented in an clear and easy to handle way to edit and present. Supports: - Editing in the tree or with different input fields - Drag-and-Drop - Mapping of XML data to tables, the outline of a table is defined in seconds - Change history with undo/redo - Copy, Search/Replace, Paste - much more
