FreeCAD has an sketch [1] workbench with constrains. Once it's draw, you can extrude it, pad it, apply the geometric boolean operations, add/substract to creat

FreeCAD has an sketch [1] workbench with constrains. Once it's draw, you can extrude it, pad it, apply the geometric boolean operations, add/substract to create complex parts [2] from the result. [1] https://wiki.freecadweb.org/Basic_Sketcher_Tutorial https://wiki.freecadweb.org/Basic_Sketcher_Tutorial [2] https://wiki.freecadweb.org/PartDesign_Workbench https://wiki.freecadweb.org/PartDesign_Workbench