Marble
Open Source
Marble is a virtual globe and world atlas.
uebermaps
Free
uebermaps allows you to discover & share your favourite spots. Create maps with friends, family for free.
NASA World Wind
Open Source
NASA World Wind Software Development Kits (SDKs) for geo-spatial 3D virtual globe visualization via OpenGL/WebGL on Android, Java and JavaScript/HTML5.
Compare Google Earth with alternatives
Compare Marble and Google Earth and decide which is most suitable for you.
Compare NASA World Wind and Google Earth and decide which is most suitable for you.
Compare uebermaps and Google Earth and decide which is most suitable for you.