- Microsoft XML SDK
- James Clark's nXML mode for emacs
- A new mode for editing and auto validating XML documents from within GNU Emacs. Look for the latest nxml-mode-200nnnnn.tar.gz distribution on his download site.
- XML Standards Library
- Xemantics has taken all the W3C recommendations having to do with XML (including XSLT, OWL, SVG, the whole alphabet soup) and turned them into an HTML Help (
.chm) tree. It's got a neat installed so you can get check for updates, install the latest versions, add documents, and get rid of documents you aren't intereted in. Free.
- XML Notepad 2007
- Microsoft's original free XML Notepad was useful for a handful of things, mainly displaying a tree view of an XML document, making visual inspection of generated XML easier, validating the document (which sometimes worked), and entering text into the document (if you wanted to badly enough). The 2007 version (still free) is considerably improved, and it even lets you preview the output from an XSLT file you specify on the XML file you're editing. XML Notepad has crossed the line from neat demo to useful tool.