WeChat

The best lifetime free messaging software ever. Even you can voice chat in this app. Its a bit heavy weight, but it does its job really well. Try it!

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Spy Camera

A Spy Camera for Android. With this app, you can take photos or record videos secretly without anyone knowing. 
 Have you ever wanted to record someone or something without having your screen show what you are recording? Spy Camera allows you to do this with ease. 

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Facebook Messenger

The best way to connect with Facebook Messages, text your friends for free. Get Facebook Messenger to instantly reach friends on their smart phones, feature phones or desktop computers.
Chat heads bring your messages and texts front and center.

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Firefox

Firefox for Android is the free mobile web browser that puts the power of the open web in your hands. The official Mozilla Firefox android browser is fast, easy to use, & customizable, with the latest security and privacy features to help you stay safe on the internet.

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Clean Master

If you're running low on space on your Android device, Clean Master makes it easy to identify what's hogging your storage, and helps you get rid of it.
 Once you open Clean Master, you'll get some graphs showing your used and unused space on the device's onboard storage and SD card, but most of the action takes place in the History section of the app. Here, you'll see the cache size of all of your installed apps, which you can delete selectively or with an automated "Clean" option that gets rid of most caches, but saves important ones. Another tab shows you residual files left over from apps you've deleted, and lets you trash them with just a tap.

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WhatsApp

WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.
 In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.

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Cricbuzz

Want to know the latest Cricket score? The best way is Crickbuzz! Its free and really easy to use too. You can even know about any player carrier statistics.

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Ragging Thunder II

Ragging Thunder II is a really cool car racing game. It will take you through abandoned temples, tropical beaches, snow-covered mountains, the Great Wall and a range of other breathtaking vistas the world over!

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Facebook

The official application of the largest social network site.
Keeping up with friends is faster than ever.
• See what friends are up to
• Share updates, photos and videos
• Get notified when friends like and comment on your posts
• Text, chat and have group conversations
• Play games and use your favorite apps

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Temple Run Oz

Disney and Imangi Studios present Temple Run Oz – a brand-new endless runner inspired by Temple Run 2 and the film Oz the Great and Powerful. Play as Oz and outrun the shrieking flying baboons as you turn, jump and slide your way across the land. Begin your exhilarating adventure now and see how far you can run! In Google App Store it is not free, but here it is absolutely free of cost!

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avast! Free Mobile Security

avast! is the best free antivirus available in the Google Play Store. Even some paid antiviruses can't do the job of avast! Protects you from malicious attacks and helps you locate your lost or stolen device. Rated 4.7 of 5 stars in Google Play store!

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From where to Install Applications?

Android's biggest App Market is Google Play Store. You can download a lot of verified apps from this, in other hand you can download E-Books, Films too!

But sometimes in-store apps they are not free, in that case you can simply search google for its .apk file and install it. Before installing .apk files from 3rd Party Websites you have to insure that 'Unknown sources' button is checked! To make it happen go to Settings > Security > Unknown sources