Skype

Microsoft's communications application, Skype has now crossed a mark of 1 Billion downloads on Android app downloader 'Play Store'.It has now entered an elite club of apps dominated byFacebook.

Despite tough competition from the new apps on play store, Skype has kept it;s position and travelled a long way to get it to that level.

It gave certain must use features like 'share highlights' and 'chat add-ins' which make it excellent video-calling and messenger app.