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.
Sygic Travel Maps - Itinerary planner for independent travelers
RadarBox - Real-time flight tracking app with one of the best and most accurate coverage worldwide.
TRAVO - Instantly create end-to-end trips around your events.
FlightAware - Live Flight Tracking
Tripsy - Planning your trip has gotten much easier.