Datahike - A durable datalog database adaptable for distribution.
XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
Datomic - The fully transactional, cloud-ready, distributed database
Oxygen XML Editor - Oxygen XML Editor provides a comprehensive suite of XML authoring and development tools.
MarkLogic Server - MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.
Liquid Studio - XML Tools Provider: XML Studio - Graphical XML Schema Editor.