Free and open-source applications for learning about and enjoying the Universe + Websites to learn about 3I/Atlas

Best free and open-source applications for astronomical work

A few days ago we shared a great and interesting post related to Free and open-source software, available and focused on the peaceful use of nuclear energySince nuclear energy is vital today for the energy, scientific, and technological development of any nation, and as expected, The Linux universe always has much to contribute to any field of human knowledge.However, there are other, less flashy or more exclusive scientific fields that, without so much publicity, are often very interesting and even quite popular with many people who are not usually recognized researchers or scientists. A good example of this is astronomy, which has recently been in vogue due to important events such as the [event name missing]. Comet 3I/AtlasTherefore, today we will dedicate this post to introducing you to some of the "Best free and open-source applications for astronomical work".

And yes, we have talked about programs like this on previous occasions. Stellariumwhich we will also include this time. But there are many others that we have never mentioned, such as Celestia and KStarswhich are worth knowing, using, and sharing. So, without further ado, Keep reading if astronomy is a science and hobby that you are passionate about..

Nuclear Technology and the Linuxverse: Free and Open Source Programs

But, before we delve into introducing and describing these interesting and useful features "Free and open applications for astronomical work"We recommend you explore and read our previous publication Regarding the software and resources of the Linuxverse used in the field of Nuclear Energy, after reading this publication:

Let's not forget that, much to humanity's chagrin, all technology, including free and open-source software, can have a dual purpose or end, or more specifically, can be used for both good and evil, or for the selfish benefit of a select few. And when it comes to war or the military, the Linux universe can supply or offer the Linux allows for the development of more secure and resilient software, faster and more efficiently than proprietary, closed, and commercial software. However, regarding the peaceful use of nuclear energy, the Linux community, through the IAEA, contributes its valuable expertise in this area. 

Related article:

Nuclear Technology and the Linuxverse: Free and Open Source Programs for the Energy of the Future

Best free and open-source applications for astronomical work

Stellarium

Stellarium is a free, open-source planetarium for your computer. It displays a realistic 3D sky, just as you would see it with the naked eye, binoculars, or a small telescope. Furthermore, Stellarium is distributed under the GPL license and is capable of rendering realistic skies in real time using OpenGL. It is available for Linux/Unix, Windows, and macOS. latest version available Currently, it is version 25.3, dated September 29, 2025.

Exploring Official Web y GitHub repository.

Celestia

Celestia is a free and open-source, cross-platform software package that offers a real-time, photorealistic, three-dimensional visualization of the solar system, the galaxy, and the universe. It has proven to be a valuable tool for astronomy education and is used in homes, schools, museums, and planetariums worldwide. Versions are available for Windows, Macintosh (macOS X), and Linux. latest version available Currently, it is version 1.6.4, dated November 4, 2023.

Exploring Official Web y GitHub repository.

kstars

KStars is a free, open-source, and cross-platform (Windows, macOS, and Linux) astronomy software that offers an accurate graphical simulation of the night sky from anywhere on Earth, at any time and date. Its visualization capabilities include up to 100 million stars, 13.000 deep-sky objects, the eight planets of the solar system, the Sun and Moon, and thousands of comets, asteroids, supernovae, and satellites. latest version available Currently, it is version 3.7.9, dated October 14, 2025.

Exploring Official Web y KDE Repository.

Other suitable free and open programs to enjoy Astronomy

1. Aladin Desktop: Celestial atlas that allows you to view and manipulate digitized astronomical images and more.
2. AstroImageJ: Tool for the analysis of astronomical images and precise photometry.
3. CosmoniumA very comprehensive program for 3D astronomy and space exploration.
4. Gaia sky: 3D astronomical viewing desktop and virtual reality program.
5. Ginga: Toolkit designed to create scientific image data viewers in Python.
6. KosmorroCLI tool to obtain the rise, culmination, and set times of each object in the solar system.
7. Mars-Sim: A Java-based simulator that simulates the first generation of humans to set foot on Mars.
8. OpenSpaceInteractive data visualization software based on the project Digital Atlas of the Universe.
9. siril: Astronomical image processing software.
10. SkychartIt allows you to generate star charts, using data from numerous catalogs of stars and nebulae, and more.
11. Skyviewer: OpenGL-based program that displays HEALPix-based sky maps and FITS-formatted files.
12. Tenmon: Viewer, converter and indexer of astronomical images and photos in FITS and XISF format.
13. Virtual Moon AtlasReal-time lunar observation software.
14. XEphemInteractive and multiplatform program that maps the stars, simulates the sky and generates ephemerides.

3 Spanish websites about Comet 3I/Atlas

1. NASA in Spanish about Comet 3I/Atlas
2. 3I/ATLAS Orbital Journey
3. 3I/Atlas: Third Interstellar Visitor of our solar system

For English speakers, we recommend the website The Sky Live.

Related article:

Stellarium 0.14.2 for lovers of astronomy

Summary

In summary, we hope this short but interesting and informative post about some important software projects associated with some of the best and most popular [platforms/companies/etc.] will be helpful. "Free and open applications for astronomical work"may it be useful and relevant to many. But above all, to those who are, at the same time, Linux users and those passionate about studying and enjoying objects and elements of SpaceFinally, if you would like to suggest or recommend any other similar programs or websites that contain programs of this style, we invite you to write to us via comments so that we can take them into account for a future publication supporting these worthy and valuable programs in the field of astronomy.