What are some alternatives?
SketchUp - 3D for Everyone
FreeCAD - An open-source parametric 3D modeler
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
BRL-CAD - BRL-CAD: Open Source Solid Modeling
Onshape - Onshape is the first full-cloud 3D CAD system. It runs in a web browser and on any mobile device.