Android (free) and iOS (free)
GateGuru provides airport terminal maps and a searchable index of businesses inside airports in the United States, Canada, Europe, Asia and Australia. "Whenever I'm in an airport, it shows me what kind of restaurants are around me, which is fantastic because then I'm not tempted to eat fast food," says comic Dan Nainan. "In addition to functioning as a traditional airport navigation app, you can also read user reviews on restaurants, shopping and other amenities offered at the airport," says Money Crashers' Schrage. It's worth noting, however, that neither app has been updated since summer 2013.
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