I have looked at software like Sweet Home 3D, OpenPlan3D, and various cloud-based services that cost money. As nice as they look, they each have severe limitations -- main the inability to create accurate measurements for walls. For example, Sweet Home 3D doesn't give enough precision to create a wall with a 9/16 fraction. OpenPlan3D the field is disabled.

I would like to be able to build a 2D floor plan, but also be able to convert it into a 3D model that I can then add furniture to for interior decorating. I would prefer open source, but would settle for simply free to use.