From http://www.editix.com/ :
"EditiX is a powerful and easy to use XML editor, Visual Schema Editor, XQuery Editor and XSLT debugger for Windows, Linux and Mac OS X designed to help web authors and application programmers take advantage of the latest XML and XML-related technologies such as XSLT / FO, DocBook and XSD Schema. EditiX provides users with an extensive range of XML functionality within a refined IDE that guides you with intelligent entry helpers. EditiX has realtime XPath location and syntax error detection. Helpers are also provided with context syntax popup supporting DTD, Schema and RelaxNG. EditiX supports multiple templates and project management. User can apply XSLT, XQuery or FO Transformation and show the result with a dedicated view. All the process can be managed by shortcuts. Working locally is managed with OASIS XML Catalogs. EditiX includes default templates with XML, DTD, XHTML, XSLT, XSD, XML RelaxNG, SVG, MathML and XML FO."
See list of features at http://www.editix.com/ .
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Runs on Windows, Mac OS X, or Linux. Requires at least a Java VM 5.x.
Source code and licensing
Commercial software, but EditiX Free XMLEditor Lite is free for non-commercial environments and can be downloaded without registration at http://free.editix.com/download.html .
Support for TEI
Documentation in English.
Current version number and date of release
Version 2008 (Build 020108) is the free version (http://www.freexmleditorsite.com/download.html). Version numbering uses the current year and the build number.