This is a paid asset, but now you can download Low Poly Tools Bundle Free.
Detail this asset from Unity Store: Original Link
Low Poly Tools Bundle v1.0
High quality and easy to use assets for Low Poly Level creation.
This bundle provides everything you need to build a gorgeous Low Poly Level and bring your project to life.
By purchasing this bundle, you will save 20% of the total value combined.
After purchasing, please visit the pages listed below to download the latest version of the included assets:
– Polaris 2021: A complete low poly terrain tool. Sculpting, texturing and planting at ease.
– Poseidon: A fast and feature-rich low poly water shader.
– Jupiter: A fully customizable sky shader with day night cycle.
– Texture Graph: A node editor for procedural texture creation.
All assets are compatible with Builtin RP and Universal RP.
For features detail, please see the store page of each asset.
Documentation
Polaris | Poseidon | Jupiter | Texture Graph