AutoCAD is undoubtedly the most popular and powerful CAD modeling software. But as a commercial software, it is really, really expensive. FreeCAD is a free, open-source, cross-platform and general-purpose 3D CAx (CAD, CAM, CAE), PLM modeling tool specially designed for home user/hobbyist, experienced CAD user, programmer or educator.
Sweet Home 3D is a free, open-source and cross-platform (written in Java) interior aided design software from France. It can help you design and decorate your furniture on a 2D house plan, and allows to preview the whole panorama of the decoration layout with 3D perspective.
As a simple and easy-to-use 3D designing (CAD/CAE) software, the integrated 3D design environment of SolidWorks covers all aspects of products development. Its comprehensive and abundant modeling functions for parts entity sometimes come as a surprise that beyonds designers' expectations.