Live Home 3D Pro - Live Home 3D Pro is a nimble and completely operative 3D modeling tool that allows designers and architects to do interior designing with ease.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Blophome - Decorates, draws or designs any room in your house or office.
SketchUp - 3D for Everyone
Assetforge - Asset Forge allows anyone to create 3D models and 2D sprites using building blocks.
FreeCAD - An open-source parametric 3D modeler