What are some alternatives?
SketchUp - 3D for Everyone
FreeCAD - An open-source parametric 3D modeler
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
Onshape - Onshape is the first full-cloud 3D CAD system. It runs in a web browser and on any mobile device.
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.