FlightAware!

Flightradar24 allows you to track:* Planes moving in real-time* Airline and callsign information for individual planes

The adsbSCOPE software is another free ADS-B radar program with network sharing options. You can download ADS-B data which is shared by other adsbSCOPE users to augment your own local radar setup. This allows you to have a global air radar.

Open source project displaying aircrafts, vessels and gps trackers on a map. Browse through the data based on a particular aircraft, airline,airport, owner, vessel or tracker to search through the database or see extensive statistics. Can use ADS-B in SBS1 format (dump1090, Radarcape,...) or VRS, some IVAO sources (whazzup.txt, phpvms,...), ACARS (acarsdec, acarsdeco2), NMEA AIS, APRS and many more as datasource.

Variflight-Live on Time IOS app provides its users with real-time flight status info, incl. current location on the map, scheduled and actual time of departure and arrival. Users can look up airport tables and airport weather along with aircraft type and age used in a specific flight. The main feature of this app is information accuracy.Downloading the app as well as any functions and features inside the app is free.

PlanePlotter receives and decodes live digital position reports from aircraft and plots them on a chart.