Advanced Modeling & Context
Sandbox Tools : Native SketchUp Tool
Fredo6 Bezier Spline : Draws a variety of Polylines, Bezier and Spline curves, all in 3D.
Curviloft : Curviloft is a script dedicated to Loft and Skinning, that is, generation of surfaces from contours.
Soap Skin & Bubble : Allows you to apply a skin over edges to create complex curved surfaces.
ClothWorks : A cloth simulation extension for SketchUp
Artisan 2 Tools : Artisan is an extension for SketchUp that lets you do the impossible! With powerful tools for subdivision, sculpting, soft selection, free-form deformation, extrusion, and more, Artisan will supercharge your ability to model terrain, characters, furniture, and other complex organic forms.
Eneroth Upside Extruder : Extrudes profile while keeping it upright. This can be useful on everything from railings to roads.
Slicer v6.0 : A toolset to ‘Slice’ up a volume – useful in real-model making or finding likely areas in master plan volumes.