Contains below listed plugins:

1. Transmutr

Convert various 3D formats to SketchUp files, with powerful features such as automated render-ready materials and proxies, geometry simplification, as well as essential options like scaling, unit conversion, axes/origin transformations and much more. 

2. Skatter

The most powerful Scattering Extension for SketchUp. Render huge amounts of vegetation, quickly populate city blocks, create parametric assemblies, crowds, carpets, you name it… All right inside SketchUp! 

3. VRay

V-Ray® for SketchUp is a 3D rendering software that combines real-time and photorealistic rendering — all in SketchUp. From beginner to pro, Chaos® V-Ray has all the tools you need to create stunning architectural renders and animations.

 4. ClothWorks

ClothWorks is a cloth simulation extension for SketchUp.

5.  MindSight Studios Skimp

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!

6. SketchPlus

SketchPlus is new extension for SketchUp that 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. Designed to work together in a simple and intuitive SketchUp-like user experience, these tools will seamlessly integrate into any existing workflow and you’ll soon wonder how you ever used SketchUp without them!

and other, cant write all of them here.