Science & Education
2 open source tools compared. Sorted by stars. Scroll down for our analysis.
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
| Tool | Stars | Velocity | Score |
|---|---|---|---|
 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. | 10.0k | - | 79 |
 human-atlas Open-source 3D anatomy explorer: 2,234 selectable BodyParts3D meshes, system layers, search, and exploded views. | 1.5k | - | 68 |
Stay ahead of the category
New tools and momentum shifts, every Wednesday.
Our Analysis
Stellarium turns your screen into a planetarium. Give it a date and a location and it renders the sky as you would actually see it, naked eye, binoculars, or through a specific telescope and eyepiece you configure. Windows, macOS, Linux, and Haiku, shipped as a normal desktop download under GPL-2.0. No account, no tier, no upsell. Depth is what separates it from a phone star app. It carries multiple sky cultures rather than only the Greek constellations, renders 3D landscapes so the horizon matches your actual site, and its plugin system includes real telescope control. Amateurs use it to plan a session before going outside. Schools use it because putting it on thirty machines costs nothing. Install is a download and a double click. Nothing to host, nothing to maintain, no ops burden whether you are one person or a whole department. The catch is the mobile story. The desktop app is free and open source, but the phone app is a separate product from Noctua Software, not from this repository. Stellarium Mobile is free to download and the Plus upgrade is an in-app purchase at $18.99, with a cheaper recurring option. Free on your laptop does not mean free in your pocket.
Human Atlas is a 3D anatomy explorer that runs in a browser tab. It loads the BodyParts3D reference model, 2,234 individually selectable meshes across fifteen body systems, and lets you orbit, hide layers, and search anatomical terms. There is a free hosted demo, and the code is MIT so you can clone and run it yourself. React, Three.js, and Vite, which means the build output is a static site. Deploy it to Vercel, an S3 bucket, or whatever folder your school already serves. No backend, no database, no API keys. The mesh data is about 33 MB compressed, so first load is the only real performance question. Students, teachers, and anyone curious where an organ actually sits are the audience. The author states plainly that it is not a diagnostic or surgical tool, which is the right call. The catch is the license split. The code is MIT but the anatomy data is BodyParts3D under CC BY 4.0, so forking this into a product carries an attribution obligation the MIT code does not cover. The second limit is the model itself: BodyParts3D is one adult male reference, so it shows you an anatomy, not the range of them.