I used to read code from popular open source projects to see how others implement certain functionalities and also to learn from them. (I am a firm believer of the fact that you have to read good code to write good code)

Recently I have been following up a couple of good open source Android apps and thought of listing them here so that it could be useful for others.

1. 10 Open Source Android Apps Which Every Developer Must Look Into ~> http://sudarmuthu.com/blog/10-open-source-android-apps-which-every-android-developer-must-look-into/

2. 15 Sample Apps For Android Beginners ~> https://code.google.com/p/apps-for-android/

3. 14 Great Android Apps With Source Code ~> http://blog.interstellr.com/post/39321551640/14-great-android-apps-that-are-also-open-source

Well, there are a lot of platforms available online, where you could buy source code from and launch your new app or game and start earning money.

Thanks a lot. they helped