From Blender Subdivision To N.U.R.B.S. (IGES) for free - Tutorials, Tips and Tricks - Blender Artists Community
GitHub - zippy731/vamp: Vector Art Motion Processor - Blender Add-on to remove hidden edges from meshes. Generates silhouettes and line drawings similar to Blender Freestyle
Curvs in Blender 2.8, Quicktip | rgb-labs.com
Blender Discussion - Extending SketchUp - SketchUp Community