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I'm working as a private teacher. Sometimes I need to draw some geometric figures. Is there any free program to do that? I found from the Internet that Geogebra looks good but unfortunately I'm not sure if I am allowed to use it for commercial projects. I'm a non-native English speaker. Or should I just learn for example TikZ, https://www.overleaf.com/learn/latex/TikZ_package

https://www.geogebra.org/license

I would like the program to run under Ubuntu.

  • Welcome to Software Recommendations SE. On which operating system(s) should this software run? – RockPaperLizard Aug 30 '19 at 8:44
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You can read the GeoGebra license here: https://www.geogebra.org/license

Here is the part I believe addresses your question:

GeoGebra and our web services are made available free of charge for non-commercial users. Most of our users are students and teachers and they usually fall under our non-commercial license, allowing them to use and distribute GeoGebra and related materials free of charge at home and in school.

Other possibly relevant software worth mentioning:

  • Blender - if you want to make 3D diagrams or illustrations
  • Inkscape - if you want to make 2D vector diagrams or illustrations

Those two applications are primarily for art/design though. If you want to create rather complex mathematical figures, I'm guessing GeoGebra would suit your needs best. I have used all three, each for different purposes.

Edit: If you are concerned with GeoGebra's license, why not ask them?

If you are not sure whether your use is commercial or not, please just get in touch with us at office@geogebra.org.

If the GeoGebra license will not allow you to use the software free of charge, you most certainly can use Blender or Inkscape for free.

  • Yes. But I am a private teacher and I have no school. Therefore I would like to find a similar program that can be used for commercial purposes. – math tutor Aug 30 '19 at 8:58
  • @mathtutor Why not ask the publisher of the software if you can use it for your purposes? You have nothing to lose by asking. – Eric Shain Jan 27 at 14:22

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