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CAD tutorials

Here's a series of short introduction to the main strategies for geometric modeling, from 2D to 3D. Most of them are open source / freeware.

01. Introduction + Bitmap: Gimp

02. Vector: Inkscape

03. CAD: QCAD + Draftsight

04. Mesh: Blender

05. Solid+Parametric: FreeCAD

06. NURBS: Rhinoceros 3D

07. Data workflow among these softwares