Sweet Home 3D - Sweet Home 3D is a free interior design application that helps to draw the plan of house, arrange furniture on it and visit the results in 3D.
FreeCAD - An open-source parametric 3D modeler
SketchUp - 3D for Everyone
MagicPlan - The floor plan creation app magicplan lets you create dimensioned floor plans without actively measuring or drawing. With its Augmented Reality.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
DreamPlan - DreamPlan Home Design software makes it easy to plan a new house or remodeling project. 3D interior, exterior and landscape design for your home! Free download.