Astronomy freeware downloads
2017 Nautical Almanac including monthly charts with the planets' positions
Ephemeris, Blue Hour, Sun, Moon, Twilight calculator and many more
AstroMatos will help you for astrophotography
An astronomical images processing software
Strictly spoken it's a piece of software, simulating the Solar System's bodies
View a dark energy inside Solar system on your dektop with this screensaver!