NFG : Unity Level Design Tool
Natural Formations Generator is a Unity Plugin Tool that allows for rapid and intuitive level design. Build levels in minutes not days.
Auto hierarchy organization.
Layer and rule based spawning.
Rapid prototyping capabilities.
Runtime support.
Get it on the Unity Asset Store!
https://assetstore.unity.com/packages...
Lite Verison
https://assetstore.unity.com/packages...