http://roundup.sourceforge.net/ contains a link to the
design overview at
http://roundup.sourceforge.net/doc-0.7/overview.html. 
However following that link gives me a 404 error page.
 The link should probably point to
http://roundup.sourceforge.net/doc-0.7/design.html.

I am not sure this is the right place to report web
page issues, but the page itself does not have the
webmaster's email address.