XMLBlueprint is an advanced XML editor and development software application. It is designed to provide developers with a powerful and intuitive environment for creating, editing, and debugging XML-based applications. XMLBlueprint includes a full-featured text editor with support for syntax highlighting, auto-completion, and code folding. It also includes a powerful XML Parser that can validate and parse XML documents, a tree-based XML structure view, and an XPath Expression Builder. XMLBlueprint also provides support for XSLT and XSD Schema editing and debugging. With its integrated development and debugging environment, XMLBlueprint makes it easy to create and debug XML applications.
Discontinued Last release of 2008. See https://sourceforge.net/projects/xpontus/files/