This Rss Filter Plugin can be installed instantly using your wordpress admin section. Once installed you can add multiple external rss feed urls into this plugin.
Also you can set time for each and every Rss url so that it will fetch all feeds from it's server on desired time. You can also choose specific keyword
containg rss feed by using Keywords field. Again this is not all, You can even find your keywords in the "Title", "Description" or "both fields" of the rss feed and then fetch it to database.
This plugin also let's you categorised all the feeds. All categories (Categories that you have created using wordpress default programme) would be displayed in this plugin and then you can choose any of them. Rss feed will get fetch in that category.