SketchUp
SketchUp is a 3D modeling program developed by @Last Software from 2000 to 2006, and by Google from 2006 to the present.
- Google Sketchup is a free version of the program with some restricted features
- Google Sketchup Pro is the unrestricted pay version. It has a free trial of 8 hours of use offered in 2008 for SketchUp Pro 6.