It seems like everywhere you turn these days, you see a hot new app being advertised: "Download this! Try it now! There's an app for that!" But how many times have you found yourself installing an app, only to realize weeks or even months later that you never use it and it's just taking up storage space? So what are the REALLY useful apps out there? Which ones do people come back to over and over again, because they truly make their lives better, easier, or more fun?  We've done the research and asked around, and brought you the 5 most popular, useful, FREE apps out there. We're sure you'll love them as much as everyone else does. Just install and enjoy!