SketchUp - 3D for Everyone
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.
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
FreeCAD - An open-source parametric 3D modeler
Room Arranger - Design your room, office, apartment or house, plan gardens and more.
Planner 5D - Home Design Software & Interior Design Tool ONLINE for home & floor plans in 2D & 3D. Read more about Planner 5D.