Stellarium/stellarium
Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows, macOS and Haiku. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
License & maintenance
GPL-2.0 is a copyleft license: products that include or modify it may have to publish their code.
Last code push 2 days ago.