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
FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size. Developed by Juergen Riegel, Werner Mayer
License: Open Source
FreeCAD is a versatile tool focused on 3D modeling and parametric design, making it ideal for engineering applications. In contrast, QCAD specializes in 2D drafting, offering a simpler interface for technical drawings and architectural layouts.