Best Open Source Astronomy Software 2025

Astronomy Software

Astronomy Ukrainian Clear Filters

Browse free open source Astronomy software and projects below. Use the toggles on the left to filter open source Astronomy software by OS, license, language, programming language, and project status.

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1

Stellarium

A planetarium software that shows a 3D simulation of the night sky

Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets, nebulae and others things like ground, landscape, atmosphere, etc.

344 Reviews

Downloads: 2,993 This Week

Last Update: 2025-08-18
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2

Sky Chart / Cartes du Ciel

SkyChart is a software to draw chart of the night sky for the amateur astronomer from a bunch of stars and nebulae catalogs. See main web page for full download. This software is part of a full suite for astronomical observation: https://sourceforge.net/projects/ccdciel/ https://sourceforge.net/projects/indistarter/ https://sourceforge.net/projects/eqmodgui/ Requirement: https://sourceforge.net/projects/libpasastro/ See also: https://sourceforge.net/projects/indi/

45 Reviews

Downloads: 1,548 This Week

Last Update: 6 days ago
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3

Celestia

Real-time 3D visualization of space

Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects.

116 Reviews

Downloads: 81 This Week

Last Update: 2016-04-08
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4

Halachic Times

Jewish prayer times

Android application that displays list of halachic/halakhic times for Jewish prayers (zmanim and zmanei tefillot).

Downloads: 0 This Week

Last Update: 2019-02-22
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5

Observation Manager

Java based astronomical logging software which stores it's data in a free and open XML based format (OpenAstronomyLog). Discontinued project: Please check out the fork: https://github.com/capape/observation-manager for an updated version

3 Reviews

Downloads: 0 This Week

Last Update: 2020-06-16
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