SketchUp

SketchUp is a 3D modeling program designed for architects, civil engineers, filmmakers, game developers, and related professions. It also includes features to facilitate the placement of models in Google Earth. It is designed to be easier to use than other 3D CAD programs.

Google SketchUp

On April 27, 2006, Google announced Google SketchUp, a freely-downloadable version of SketchUp. The free version is not as capable as SketchUp Pro, but it includes integrated tools for uploading content to Google Earth and to the Google 3D Warehouse, a repository of models created in SketchUp. They have also added a new toolbox where you can walk, see things from a person's point of view, labels for models, a look around tool, and an "Any polygon" shape tool.

While the free version of Google Sketchup can export 3D to SKP, .dae and Google Earth's .kmz file format, the Pro version extends exporting support to include the .3ds, .dae, .dwg, .dxf, .fbx, .obj, .xsi, and .wrl file formats.

Google SketchUp can also save "screenshots" of the model as .bmp, .png, .jpg, .tif, with the Pro version also supporting .pdf, .eps, .epx, .dwg, and .dxf.

Source:Wikipedia