Sweet Home 3D is an interior design application that helps you place your furniture on a house 2D plan, with a 3D preview. This software can be run and installed with Java Web Start from project web site at http://www.sweethome3d.eu/.
Some Sweet Home 3D installers bundled with Java as well as a JAR executable file are also provided for Windows, Mac OS X and Linux at http://sourceforge.net/projects/sweethome3d/download.
The version 1.7 provides many ergonomic enhancements to help you place your furniture faster and minor bug fixes (read also http://www.sweethome3d.eu/history.html for information about recent changes).