Education software

Marble – free and open source, cross platform software that represents a virtual globe and an atlas of the world

Google Earth – free and crossplatform a virtual globe that provides geographical and cartographic information

KStars – free and open source, cross-platform virtual planetarium that shows the night sky from anywhere on our planet

Stellarium is a free and open source, multi-platform desktop planetarium, renders 3D photo-realistic skies in real time with OpenGL