"I'd recommend the LibreCAD and FreeCAD. both are as powerful as the costy packages out there. LibreCAD is a 2d Drafting software. Freecad is a parametric 3d modeller. I use LibreCAD for floorplan design and FreeCAD for making mechanic objects. Another Interesting Article about CAD Programs: https://www.xp-pen.com/forum-6119.html"