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I am writing a paper which includes a fair bit of (euclidean and projective) geometry. I would like to be able to create some nice illustrations to accompany the proofs, and I'm hoping there is some software that could make this easier.

In particular, I want to draw spheres, planes, straight lines, arrows, and if possible some free-form lines. I would prefer to be able to draw these without needing to specify equations, kind of like in Microsoft Powerpoint. It would also be nice if I could rotate the drawing in 3D to be able to see it from different perspectives.

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  • $\begingroup$ You could try GeoGebra, which is free. $\endgroup$ – Aretino Jul 10 at 20:25
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In the past, I've used SketchUp. It does what you need.

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