Terrain toolkit updated to Unity 5.5
"The Terrain Toolkit project was created by Sándor Moldán as part of the Unity Summer of Code 2009. The objective of the project was to develop a toolset for the Unity Editor which would streamline and improve the workflow involved in creating terrains for games. The result is the Terrain Toolkit component - an integrated solution for terrain generation in the Unity game engine. "
From https://code.google.com/p/unityterraintoolkit/
Code license: MIT License