You have:

Link Preview Image SketchUp Extension Warehouse

Your library of custom third-party extensions created to optimize your SketchUp workflow.

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(extensions.sketchup.com)

And also Profile Builder 2 which has the same principles for estimation with the added bonus of genereating profile and assembly geometries in a parametric way:

Link Preview Image Learn Profile Builder

Master Profile Builder with our in-depth user guides and video tutorials.

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Profile Builder 4 (profilebuilder4sketchup.com)