TerraHE (TerrainHeightmapEditor) is a simple tool for terrain heightmaps. What it does is basicaly applies a heightmap texture from nearly all formats(.PNG , .JPG , .GIF etc) no need to be black&white , you can just use colored textures too , and It also lets you edit height according to your wish.Therefore , with that asset you no longer need .RAW files ,extra effort to change it's height tone and such. This was a problem for me while I first start to use heightmaps in Unity. Then I came across with heightmap's editing problem. And here , I made this asset for developers who suffer same.