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Sketchup is a 2D&3D architectural designs software. Revit can export models in a specific file format that you can then import and edit using the Google sketchup program.Also You can import AUTOCAD all version files drawing image & edit.
You can make 2D,3D, animation ,section, layout and presentation so on by using sketchup. It has 3D Warehouse,Extention Warehouse etc.