Plugins

DropGC Drop groups/components to face below http://www.smustard.com/scripts/

Fredo6: Bezier Spline http://sketchucation.com/pluginstore?pln=BezierSpline

CleanUp³ https://extensions.sketchup.com/en/content/cleanup%C2%B3

Solid Inspector² https://extensions.sketchup.com/en/content/solid-inspector%C2%B2

Solid Solver http://sketchucation.com/pluginstore?pln=TIG_solidsolver

FredoTools http://sketchucation.com/forums/viewtopic.php?t=42089

1001bit Tools A collection of various tools useful for fast creation of architectural elements https://extensions.sketchup.com/en/content/1001bit-tools-freeware

TopoShaper http://sketchucation.com/forums/viewtopic.php?f=323&t=52039

https://www.youtube.com/watch?v=oWjVrL0oetQ