MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Altova XMLSpy - The XMLSpy XML Editor is a powerful tool for editing XML and related technologies. It is the only XML Editor with patented SmartFix validation, enterprise-grade editors, converters, debuggers, and code generators.
Qizx - XML Databases
XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
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.