Are there any popular HN clients that support tagging? It seems like something a good number of people want. Maybe it could be added on top of HN by a third par

Are there any popular HN clients that support tagging? It seems like something a good number of people want. Maybe it could be added on top of HN by a third party if a client app/site had enough people to support it. It's never been something I've wanted, but I can see the appeal.