[ubuntu-in] Need a feed aggregator

[stereotactic]

Hi All,

I need an offline feed aggregator which should also be able to output 
the URL.

Here's what I have in my mind.

1) I feed in the RSS feeds from different sources.
2) Filter out the content using keywords.
3) The filtered content be available as an OPML file so that I can use 
it on my Google Reader.

Is there any solution like that for Ubuntu?

Thanks in advance!
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