App: GasBuddy.
Available on: Apple, Android, Windows and BlackBerry devices.
Cost: Free.
The GasBuddy app lets drivers search for cheap gas prices across the country. The product was first made popular by the website of the same name, and now smartphone users can access gas information on the road, says Ari Kissiloff, a frequent traveler and assistant professor in Ithaca College's School of Communications in New York.
GasBuddy users can search for stations by city, state or ZIP code on their smartphones. Pricing information is crowd-sourced, meaning users submit per-gallon costs as they drive by and see them on gas station signs. "The app is popular and has a large number of users, so it's updated frequently and the gas prices are usually quite accurate," Kissiloff says.