So Android Fans, Tell Me. What are Your Favorite Apps?

What are the apps on your Android device that you just can't get by without?  
  My primary device is still an iPhone. That is largely due to the massive library of applications that I have downloaded over the past few years. Some apps are throw aways, some are for just pure entertainment, but a large portion of these apps are what keep me on the iOS platform. They are those kind of apps that get me through my day and just simply make life easier. Are there apps you like that keep you tied to the Android platform? I would be interested in hearing what those are.  
  Thanks. 

What are the apps on your Android device that you just can't get by without?

My primary device is still an iPhone. That is largely due to the massive library of applications that I have downloaded over the past few years. Some apps are throw aways, some are for just pure entertainment, but a large portion of these apps are what keep me on the iOS platform. They are those kind of apps that get me through my day and just simply make life easier. Are there apps you like that keep you tied to the Android platform? I would be interested in hearing what those are.

Thanks.