Many times we want to merge or mix multiple websites RSS feed together to show information from many sources together like sharing recent news from BBC, CNN, CNBC and NDTV together.
One way is to use separate RSS feeds from all different sites to show the information. But it will increase our work. Other way is to use merge or mix the RSS feed from different sites together. If we 
have merged multiple feeds then we don’t have to use separate RSS feeds. It will make our work easier and your site visitors will see information from multiple sites together at one place.
You can use FeedKiller and RSSMix to merge RSS feeds. RSSMix is also recommended by Wordpress. You can combine any number of feeds. They will generate the merged feed quickly and you just need a RSS feed reader like Google Reader, Bloglines or Newsgator to read them.
But the problem is that you need to merge feeds again and again to include latest updates from the sites. This is a manual task.
If you know more better tool, Please share with us 
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