Gaia Sky is a real-time, 3D, astronomy visualisation software
Siril
A free astronomical image processing software
Marble
Marble es un globo terráqueo virtual y un atlas mundial: tu navaja suiza para mapas que puedes usar para aprender más sobre la Tierra y otros planetas.
Stellarium
Stellarium is a free open source planetarium for your computer.
Krshtrs
KStars is a Desktop Planetarium by KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time.
Celestia
Celestia – real-time 3D visualization of space