ADSBExchange - The world’s largest co-op of ADS-B/Mode S/MLAT feeders, and the world’s largest public source of unfiltered flight data. Access to worldwide flight tracking data for hobbyists, researchers, and journalists alike.
Foursquare - Foursquare is all about helping you find new ways to explore your city.
RadarBox - Real-time flight tracking app with one of the best and most accurate coverage worldwide.
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
FlightAware - Live Flight Tracking
Yellow Pages - YP.com local search connects you with over 19 million local businesses.