MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
Qizx - XML Databases
Oxygen XML Editor - Oxygen XML Editor provides a comprehensive suite of XML authoring and development tools.
BaseX - BaseX is a very light-weight, high-performance and scalable XML Database engine and XPath/XQuery...
Liquid Studio - XML Tools Provider: XML Studio - Graphical XML Schema Editor.