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Kindle for Android is one of the finest ereader apps available. It enables your tablet or smartphone to gain access to millions of books -- and it allows you to read them under any light, use a built-in dictionary, and sync your ebooks with your Kindle or PC.
For many businesses, Google+ seems to be a better fit than Twitter or Facebook. So why not make use of it on your tablet or smartphone? With seamless integration into the Android platform, using Google+ on an Android device is simpler and more elegant than the other social network apps.
LogMeIn Ignition is the most expensive app on the list. But it's also one of the most important ones if you use LogMeIn to handle remote administration tasks. I use this tool daily, and on a number of occasions, I have deployed it for clients.