If you've ever felt insecure or uneasy when going home at night, even if it were just your imagination playing tricks on you, you'll find Companion a rather decent app to install on your iPhone. It's an application that watches over you and offers you a virtual escort until you arrive at your destination safely.
The application that walks you to your doorstep.
How Companion works
You basically have to choose several contacts that will be your companions and that can check out how your travels are going on a map. If they detect anything suspicious on your way home, they can get in touch with you just tapping their screen.
Furthermore, if you're not feeling too comfortable going back home (or wherever you're going), from the application itself you can tell your contacts that something isn't alright or directly call the police.