Google Earth is described as 'Explore Earth's vast landscapes and urban wonders with detailed satellite imagery, offline access, and ad-free experience' and is a leading Map service in the travel & location category. There are more than 50 alternatives to Google Earth for a variety of platforms, including Web-based, Windows, iPhone, Android and iPad apps. The best Google Earth alternative is OpenStreetMap, which is both free and Open Source. Other great apps like Google Earth are Marble, HERE WeGo, NASA World Wind and 2GIS.