Developers around the world offer extensions or plugins to add extra functionality to SketchUp.
Extions can be found in various locations, including the Extension Warehouse, Sketchucation, or directly from a developer site.
Below are a list of some of my favorite extesions.

Enscape 3D
Real-time immersive, photorealistic rendering with live link & VR.
Scatter 2
Render huge amounts of vegetation, quickly populate city blocks, create parametric assemblies, crowds, carpets, you name it…
Profile Builder 3
Quickly create profiles and assemblies for frequently used items.
SU Placemaker
Stop wasting your project budget on creating site context. PlaceMaker automates the creation of your site model with a simple mouse stroke!
FlexPack Pro
Architects and 3D artists use FlexTools to generate SketchUp doors, windows and more, with exceptional levels of speed and control.
Finally! Pain-free FAST import and simplification of high-poly models into SketchUp! Supports FBX, OBJ, STL, DAE, and more. Skimp is a new professional import extension designed to make it fast and easy to import high-fidelity models into SketchUp!
Adds more than 30 easy-to-use tools, many of which are commonly found in other 3D modeling applications such as selection filtering, selection memory, mirror, and align.
One of my favorites. Align, rotate, resize, spread and center components. This is the 2D alignment tool SketchUp is missing.
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