Astronaut Simulator 3D - Space Base is a nice game that lets you explore the outer space. You're on a space base surrounded by control panels, technical devices, and suspended in gravity-free-state. Outside your spaceship there is just outer space and the far-far away planet Earth. You will feel like a real astronaut while participating to difficult space missions.
SkyChart III is a planetarium and telescope control program that shows the sky from any location, past or future, on Earth or beyond.
