a flight tracking service that provides you with real-time info about thousands of aircraft around the world. Using flight information data from aircraft by ADS-B transponder (in ~60% of all passenger aircraft) and delayed (~5 min) data from the Federal Aviation Administration (FAA).
a open source tool and free web service that lets you map your flights around the world, search and filter them in all sorts of interesting ways, calculate statistics automatically, and share your flights and trips with friends and the entire world (if you wish).