Have you tried http://www.gnoosic.com http://www.gnoosic.com ? It is run by a HN user who does a whole lot of discovery research over at http://www.gnod.com htt

Have you tried http://www.gnoosic.com http://www.gnoosic.com ? It is run by a HN user who does a whole lot of discovery research over at http://www.gnod.com http://www.gnod.com