QCAD is a free computer-aided design (CAD) software for 2D design and drafting. Developed by RibbonSoft
License: Free Personal
Apps available for Mac OS X Windows Linux
SolidWorks is a solid modeling computer-aided design (CAD) and computer-aided engineering (CAE) computer program that runs on Microsoft Windows. Developed by Dassault Systèmes SolidWorks Corp.
License: Commercial
Apps available for Windows