Yahoo! Pipes is a sophisticated composition tool for manipulating RSS feeds. With it, you can filter, sort, translate and geocode your RSS feeds into perfection. For the simpler task of just aggregating multiple feeds into a single RSS feed, there’s Feedstitch. Both tools are free, and allow you to use your resulting RSS feeds however you wish.
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Feldman, Barbara. "How to Aggregate Multiple RSS Feeds." Surfnetkids. Feldman Publishing. 7 Jul. 2009. Web. 23 Oct. 2014. <http://www.surfnetkids.com/tech/419/how-to-aggregate-multiple-rss-feeds/ >.