Altova XMLSpy is an advanced development software and application for editing, validating and debugging XML, JSON, and related technologies. It provides a graphical interface for editing XML, JSON, and related files, as well as a powerful text editor with syntax highlighting and code completion. It also provides support for XML Schema, Relax NG, XSLT, XPath, and XQuery. Additionally, it allows users to connect to and query databases and web services, and to generate HTML/CSS reports. Altova XMLSpy is an invaluable tool for software developers, webmasters, and other professionals who work with XML, JSON, and related technologies.
If you are like me and need to parse (large) XML files with xpath, this program works best. It doesn't add all the bloatware that XMLSpy does, and it's much cheaper!
Discontinued Last release of 2008. See https://sourceforge.net/projects/xpontus/files/
Affordable, XML grid editor and active development.