Download InTerra ~ Terrain Features Free Unity.
InTerra ~ Integration of Objects into Terrain (Advanced Terrain Blending), Hiding texture repetition, Heightmap blending, Triplanar mapping & More
The main feature of this Asset is the visual integration of Objects into Terrain.
It was designed to be as realistic and seamless as possible and it will help you to create very diverse and unique terrains. It is also very easy to use, there is no need for script attachment, you just choose the shader as you can see in the video.
There are two shaders included – one for Objects integration (which also works with Unity Terrain Standard shader) and one for Terrain (which is basically Standard with additional features). Both shaders are shader model 3.0 and are originally designed for PC(Windows) but I did some successful Linux and Android testing (although it might be rather heavy for mobile – depending on the features you choose – there is also the possibility for Terrain shader to sample only two layers and be lighter than the Unity Terrain Standard).