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   There are so many apps available, it can be overwhelming to find the right ones. Here is a list of 15 free apps which I have found useful. I am using all of them on my iPad but many are also available for other mobile devices.  1. Flipboard      This has become my favorite app and I use it more than anything else. It turns all of your social streams from sites like Facebook and Twitter into a virtual magazine. You can also add any other sites that you love to read to read on the go. The layout of this app is just beautiful.