Best Driving Apps

Hi guys,

I'm doing a project at work and need to find some of the best driving- or car-related apps out there on the App Store. Do you know of any great or useful apps?

We're trying to avoid things like the TomTom app as we're trying to mention the apps that aren't big names. Please if you have experience with any of these apps chuck it in a comment though, it'd be appreciated ^_^

Thanks guys!