This tool allows you to turn meshes into a beautiful terrain with procedural textures, grass and trees. It uses Geometry Nodes and it's very simple to use. It adds a procedural material to the object, displaces it, adds a layer of grass on the top and scatter some trees. Since it uses instances, it can handle a huge amount of geometry at the render time. It's very useful when you need to fill a backgound or add grass to a surface.

https://blendermarket.com/products/procedural-generator-bundle