How to Make a Paper Chrysanthemum. 3ds Max NURBS. Free Sketchup plugins for download. Sketchup is, by far, the easiest tool for modeling.
Google acquired this software in order to crowd-source the 3D modeling of the earth, since anyone can use it to model their house, school or favourite building. But being simple and fast doesn’t mean it lacks on features. You can enable several options available on the free standard version, or go pro for more. Also, you can extend it via plugins. Below, two plugins I have found very useful, and also available for free.
CAD addict: SketchUp: List of Plugins. If you are new to Ruby Scripts, check this post on How to Install SketchUp Plugins.
There are other online resources to find Ruby scripts online. Some of the best online libraries where you can find and download SU Plugins are, as far as I know: