SketchUp
From Game Making Tools Wiki
intro
Tutorials
- ...
Extensions
The easy way to install extensions is by loading the extension warehouse from within SketchUp. If you want to download them with your broswer you'll need to add the downladed bundle via the Window>Preference or SketchUp>Preferences menu iteams. For more details see the official instruction page.
- SketchUV - UV mapping helper.