My most useful smart phone apps are those I put on my phone's home screen. I can get to them with the fewest taps possible and that makes things simple and saves me time.
Camera. This is the standard camera app that comes with my Samsung Galaxy S III. There are other phone apps but I haven't found the need to install a different one. I might change my mind in the future though and a blog post would announce it.
Any.do Task Manager. FREE
feedly news app. FREE
Please share your comments or favorite apps. I love discovering new and, most importantly, useful apps. Thanks