Flightrader24

Flightradar24 is one of the best web applications to come along in a while. It allows you to live track every aircraft equipped with an ADS-B transponder,which for Europe is about 90% of all airplanes. It’s easy to use,clean and it doesn’t require so much effort from the CPU, even in the highest visualization conditions where hundreds of flights are shown and animated at the same time. The web version is completely free, while mobile apps for iOS and Android cost a few bucks, as well as the Mac OS X application.