JXHTMLEDIT is a cross-platform WYSIWYG HTML/XHTML content authoring tool, a very small Java applet based on the Java 2 Platform.
XStandard is the leading, standards-compliant plug-in XHTML WYSIWYG editor for Windows and browser-based (IE / Firefox) content management systems. Advanced editing capabilities,
Free XHTML Reference with example XHTML document and self validation code.
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XHTML Doclet is a standards-compliant alternative to the Javadoc standard HTML doclet.
Now that you’ve got the Basics of XHTML down, it’s time to get way deeper.
ProdLer - A multi-language PHP content management system that allows you to make a products catalogue quickly.
HTML Code Export is a unique and easy to use software to quickly and easily reindent, export (10+ formats supported) and print your html documents. Upgrade your old html pages to xhtml. Convert your html documents to PDF, RTF, images and more!
Aspose.Words is a Java component to read, write and modify a word document without using MS Word. It supports content & formatting manipulation, mail merge abilities, ActiveX controls and support of DOC, DOCX, DOCM, DOTX, DOTM, HTML and XHTML formats
CSE HTML Validator Lite is a fast, easy to use, and FREE HTML & CSS development tool for Microsoft Windows that helps you create problem-free HTML, CSS, and XHTML documents. It's also an excellent learning tool.