Planetariums tend to spend money on digital planetarium systems, but they don't have to. I came across a free #opensource Planetarium software that runs on #Linux.
It's called SpaceCrafter and its source code is on GitHub. I believe it can also run on Windows now. It comes with a fulldome projection mode. The core software is free, but there's also a paid plugin that enables extra features. The best part is you can run it on your own computer.
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