Sweet Home 3D is a free interior design application that helps you placing your furniture on a house 2D plan with a 3D preview.

Licensing options:

• A free version available at SourceForge.net bundled with 100 pieces of furniture and 26 textures
• A paid version available on the Mac App Store, sandboxed, automatically updated and bundled with 1500 pieces of furniture and 418 textures