3DS Solidworks (for simple models; better for surface modelling) Autodesk Inventor (flexible) Autodesk Revit (better than AutoCAD nowadays) 3DS CATIA V5/V5-6/V6/3DEXPERIENCE (for complex; better for solid modelling) Autodesk Fusion360 (beginner; student edition) PTC Creo Parametric (formerly Pro/E Wildfire) Rhino 3D (someone said it was very easy; Parametric design) OpenSCAD (coding CAD) Siemens NX
Notes
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See Creo Parametric vs Creo Direct One is like CATIA V5-6/SolidWorks, where everything is relational. The other is like CATIA V4 where things stay where you create them. At times, making a robust model in Creo Parametric is more like programming than drafting.
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Understand Scale and Machinability