JXHTMLEDIT - WYSIWYG XHTML Editor 

JXHTMLEDIT is a cross-platform WYSIWYG HTML/XHTML content authoring tool, it provides word processor-like user interface that allows to edit the document directly in the final form (as will be rendered).
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ONEView 

Gnostice ONEView is a Windows® application for viewing, printing and exporting documents from one format to another. ONEView supports viewing and printing of HTML, XHTML, RTF, picture files and files of popular Delphi? reporting tools.
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XmlShell - The Ultimate Lightweight XML Editor 

The Ultimate Lightweight XML Editor: 1.True side-by-side XML tree structural view and table/editor/browser views. 2.Grid-like table views to display table-like XML data. 3.Syntax-colored free-form text editor. 4.Intelligent popup list in editor.
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Pepys Personal Edition 

Pepys is a powerful hypertext enabled notebook designed for individuals and small workgroups. It works in a similar way to a WikiWikiWeb. However, unlike a WikiWikiWeb, Pepys does not require a web server or any kind of administrative access.
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CSE HTML Validator Professional 

CSE HTML Validator Professional is a fast, powerful, user configurable, and easy to use professional web development tool that helps you create syntactically correct and accessible HTML, XHTML, and CSS. Fixes HTML. Also checks links.
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HTML-Kit 

HTML-Kit is a full-featured editor designed to help HTML, XHTML, XML and script authors to edit, format, lookup help, validate, preview and publish web pages.
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