The SketchUp Make is a free tool that allows drawing models in 3D mode. This version is released to make 3D modelling a lot easier than using a dedicated CAD application. It offers the same features as SketchUp, but they're optimized for beginners. The application supports Google Earth and Maps integration, and it offers tutorials and tips to design fast and accurate. More information about the software can be found on the website listed below.
Official website: http://www.sketchup.com/products/sketchup-make