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.
Ecdesign - Ecdesign.
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Floor Plan Mapper - Bringing Your Office Floor Plans to Life
Palette CAD - Palette CAD is one of the easiest 3D design software for those people who want to use a simple to use program for interior designs.