Mentioned last month on XML-DEV by Ken Holman, XSL Composer is presented as "the industry's first real-time, WYSIWYG, Drag and Drop stylesheet generator". It is targeted toward webmasters more than XSLT developers.

The online manual gives the following description:

<xsl>Composer is a Web site creation application that is used for developing corporate Internet or intranet sites. <xsl>Composer's WYSIWYG ("what-you-see-is-what-you-get") environment allows you to incorporate such things as tables, hyperlinks, frames and graphics into your web site. More specifically, <xsl>Composer is a tool for developing XSL stylesheets. These XSL stylesheets dictate how information stored in existing XML files will be presented on your web site.

These XSLT stylesheets are generated after the user has defined the layout of the site and its pages, and the rules between the XML documents and these pages. The stylesheets do not seem to be updatable.

Thus XSL Composer appears to be a competitor to existing web site creation tools, rather than the XSLT development and debugging tool expected by Len Bullard and other developers.