iOS: If you're travelling during the summer holidays, chances are you'll also be doing some eating (or drinking) at the airport. If you want to be prepared ahead of time, Airport Guide is an app that gives you a map of the terminals as well as all the amenities you'll find there.
The most useful feature of the Airport Guide is the terminal maps, which are especially valuable if you're making a connecting flight and need to get a glance at where your layover is. Also included is a list of restaurants, lounges, amenities, ground transportation and parking options. Airport Guide doesn't include any info about your flights, but it gives you a lay of the land and dining options at other terminals within the airport.