XMLmind DITA Converter v3.2 features a number of enhancements to all XHTML based output formats, including a new Web Help layout called "simple".

More information in in http://www.xmlmind.com/ditac/changes.shtml

 What is XMLmind DITA Converter?

XMLmind DITA Converter (ditac for short) is a serious alternative to the DITA Open Toolkit.

Out of the box, ditac allows to convert the most complex DITA 1.0, 1.1, 1.2 and 1.3 documents to production-quality XHTML 1.0, XHTML 1.1, HTML 4.01, XHTML 5, Web Help, Java™ Help, HTML Help, Eclipse Help, EPUB 2, EPUB 3, PDF, PostScript®, RTF, WordprocessingML (Word 2003+), Office Open XML (.docx, Word 2007+), OpenDocument (.odt, OpenOffice/LibreOffice 2+).

Like the DITA OT, ditac is free, open source, software.