Blender - Blender is the open source, cross platform suite of tools for 3D creation.
FreeCAD - An open-source parametric 3D modeler
roomeon - Roomeon is simply a best in the class interior designing and decorating software that offers the 3D based designing features and functions to its users.
SketchUp - 3D for Everyone
InnoPlanner - InnoPlanner is a commercial based interior designing software.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.