Basically I want a self-hosted version of Google News. If 10 feeds have near-identical coverage of the same story, I want just 1 item, with an option to see the other 9.

I went looking for something like this a couple years ago and found ~nothing. Checked again today and now there are Entirely Too Many Things.

Hoping to find something a bit more established than somebody's abandoned weekend project. There seems to be an awful lot of that out there right now.

Looking for XML or similar output. Do not need or necessarily want any sort of front end.