The package is pretty old and its homepage http://www.viasic.com/opensource/ does not exist.
All homepage references on google point to this same defunct page. *shrug*
It is now on http://sourceforge.net/projects/gnetman/ but only as sources in the SVN repo. Last changes nearly three years ago.
Git commits durin 2008 and on Jan 24, 2011. http://gnetman.git.sourceforge.net/git/gitweb.cgi?p=gnetman/gnetman; +*datadraw-3.1.1 (25 May 2012) + + 25 May 2012; Michael Weber <xmw@gentoo.org> +datadraw-3.1.1.ebuild, + +metadata.xml: + Initial import, needed as dependency of sci-electronics/gnetman + +*gnetman-0.0.1_pre20110124 (25 May 2012) + + 25 May 2012; Michael Weber <xmw@gentoo.org> + gnetman-0.0.1_pre20060522-r2.ebuild, +gnetman-0.0.1_pre20110124.ebuild: + Version bump to latest git HEAD, fix HOMEPAGE (bug 231232) +