Does anyone know of decent free CAD software? I’ve found several, but don’t know what’s best?

JD asked: I’m looking for CAD software to help me in designing my model airplanes. I’ve searched for free CAD software but find numerous. I don’t know which is the best one.
3D is a must. Thanks

From where I can get free unigraphics software?

smart2k9 asked: It is a CAD like design software

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