Sketchup = Free 3D imaging software from Google!        
Maxwell = Amazing Render suite that makes 3d models look real (but costs $). 
Sketchup + Maxwell Plugin = Free amazingness :D

For those of you that have been rendering for years, you know the name Maxwell. Using their Render Suite, which connects to SketchUp, you can create some amazingly realistic models. The problem has been that you were required to have the full Maxwell Rend