OpenSCAD
Open SourceOpenSCAD is a powerful, free software for creating solid 3D CAD objects using a descriptive programming language. It's not an interactive modeller but focuses on constructive solid geometry (CSG) and extrusion of 2D outlines.
Key Features
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Highly precise and dimensionally accurate models.
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Excellent for parametric design; easy to create variations.
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Free and open-source with a supportive community.