ADSB Hub is described as 'The main goal of ADSBHub is to become a ADS-B data sharing centre and valuable data source for all enthusiasts and professionals interested in development of ADS-B related software'. There are seven alternatives to ADSB Hub for a variety of platforms, including Online / Web-based, Android, iPhone, Android Tablet and iPad. The best alternative is FlightRadar24, which is free. Other great apps like ADSB Hub are RadarBox (Free), ADSBExchange (Free), FlightAware (Free) and Plane Finder (Freemium, Open Source).
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.
The OpenSky Network is a non-profit ADS-B exchange for sharing real time aircraft data broadcast over the airwaves. The network consists of thousands of sensors connected to the Internet by volunteers which collect ADS-B and Mode S broadcast data.