SketchUp - 3D for Everyone
OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
FreeCAD - An open-source parametric 3D modeler
ImplicitCAD - ImplicitCAD is a programmatic CAD program, implemented in Haskell.
SolidWorks - Dassault Systèmes SolidWorks Corp. develops and markets 3D CAD design software, analysis software, and product data management software. SolidWorks is the leading supplier of 3D CAD product design engineering software.