3Dream - Design your room in 3D quickly and easily.
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.
Planoplan - Free simplest online tool for 3D interior design
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
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.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.