CAD Gratis

2D

www.Smartdraw.com

https://librecad.org/

https://www.cadlogic.com/cad-software-products/free

3D CAD

Autodesk Fusion 360

Sketchup

OpenCAD

FreeCAD: Your own 3D parametric modeler

https://www.vectary.com/

https://www.onshape.com/

https://www.shapr3d.com/

www.coohom.com

3D Modeling & Animation

https://www.blender.org/

https://www.jig.space/

3D Modeling for printing

https://www.tinkercad.com/