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.
FreeCAD - An open-source parametric 3D modeler
nanoCAD - nanoCAD is a pro-grade 2D CAD system with native DWG support and full customizability.
SketchUp - 3D for Everyone
TrueCAD - TrueCAD is an economical 2D Drafting and 3D Wireframe Modeling CAD software meant for Engineers, Architects and other technical consultants. TrueCAD works in native DWG & DXF CAD software to create and edit drawings.