http://wvware.sourceforge.net/
wvHtml: convert your Word document
into HTML4.0.
Possibly:
http://www.abisource.com/
but in this case it looks like "open doc" > "export html" manually, maybe plugins help. Not sure, what do you mean: "source software that can convert".
Or this:
http://www.zope.org/Members/sf/NuxDocument
Also the pdftohtml will give you an html page output.But you will have to work upon its graphical interface.Since it doesn't seems to be very interactive.
