progeCAD Smart - progeCAD Smart! Free version of progeCAD, the IntelliCAD alternative to AutoCAD
SketchUp - 3D for Everyone
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
QCAD - QCAD is an application for computer aided drafting in 2D.
FreeCAD - An open-source parametric 3D modeler