The Pillars of the Earth versions

Free

Google Earth gives you a wealth of imagery and geographic information.

Free

Google Earth Pro gives advanced business tools in addition to all the easy-to-use features and imagery of Google Earth.

Earth simulator that combines imagery and real-time data.

EarthDesk replaces your static desktop picture with a rendered image of Earth showing correct sun, moon, and city illumination.

Free

Java based geographic information system.