Freefall

Freefall Publisher's Description:
Puts the wonders of satellite exploration at your fingertips, simulating the flight path of more than 650 actual satellites — Global Positioning Systems, GOES, NOAA and other unclassified orbiters used by amateur radio stations, weather services, search and rescue teams and more.

Rich with simulated space views of earth and its orbiters, Freefall is a stand-alone satellite discovery and exploration application that utilizes the power of Mac OS X to seamlessly transition from one perspective to another, soaring over the continents and oceans of the world, using political and coastline data from the United Nations and earth imagery from NASA.

The 3-D viewer interacts directly with the simulator, letting you control dozens of preferences and perspectives. Create and save your own unique simulation experiences or choose from one of 8 built-in simulations, then save your journey as a screensaver.