Ashampoo 3D CAD Professional 10 - Ashampoo 3D CAD Professional 8 is a complete CAD solution for the designers and decorator that are looking for the centralized way to get done with their interior designer.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
3Dream - Design your room in 3D quickly and easily.
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.
Planoplan - Free simplest online tool for 3D interior design
SketchUp - 3D for Everyone