LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
SketchUp - 3D for Everyone
FreeCAD - An open-source parametric 3D modeler
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.
LaserGRBL - LaserGRBL for Microsoft Windows is an all-in-one, open-source GCode streamer for DIY Laser Engraver developed using pure C# code.