1 Zappos - The papular android app for shopping because of free shipping and returns on shoes ,clothing
   ,housewares and more!
Cost- Free                                                   
Download-Click Here

2 Evernote -  It is an easy-to-use, free app that help to remember everything and known as second brain.
Cost-Free
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3 Pinterest - One of the best social sharing app for android let you pin from anywhere.Pin images from the web with your camera ,explore pins and boards you're interested in.
Cost-Free
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4 Grimm's Snow White - A very interactive app for children consist of fairy tales known as best interactive  
   storybook.
Cost- $1.99
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5 Pocket- The best way to save and view articles ,video and more .Help to save articles on web and allow you to read later without internet connection .Its so papular because developers add articles constantly and publish those articles which are paid on some sites.
Cost- Free
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6 Expedia -Best android app for booking hotels & flights anywhere.They also provide holiday coupon!and many more .
Cost-Free
Download-Click Here

7 Ancestry- A very good social media app for android to build ,update and show off your family tree. You can add or edit family member and upload photos with them.
Cost-Free
Download - Click Here

8 Fancy-It is the best place to buy great things.Discover amazing stuff items that you can "fancy" and then buy.Even after buy you can share your discovery among your friend.
Cost-Free