XMLmind DITA Converter v2.6.2 (August 18, 2016):

• The EPUB 3.0 files generated by ditac are now compatible with EPUB 2.0 readers.
• Several other minor enhancements.

More information: 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 or 1.2 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+).

As of version 2.6, XMLmind DITA Converter has partial support for DITA 1.3. Full DITA 1.3 support is planned for year 2016.

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