The art of forgetting isn’t hard to master. No matter how organized and prepared we attempt to be, sometimes well, it happens. We forget stuff. But what if there was an iPhone app designed to ensure you don’t ever walk out the door without everything you need? Don’t Leave It! is a location-based reminder app that helps you keep track of your everyday necessities, so you always remember to take them with you when you leave. And best of all: it’s free.