Google Play
Now your favorite music, books, movies, apps, and games are all in one place that's accessible from the Web and any Android device.
Google Play - The Google Internet Shoppe is ready for you to discover, buy and share like never before.
https://play.google.com/about/
If you are interested in developing an app and free app development and hosting platform are available like blogging platforms now.
Ways to create and host your app - free opportunity