TerrainEdge is a tool developed by Syanyde (original thread). It allows you to generate terrains using a variety of noise options, and contains many different tools such as creating slopes, fixing seams, combining / splitting terrains and more. However, the tool is a little old and doesn’t work out of the box with latest versions of Unity anymore, and there are a few bugs.
Since I still find the tool useful, I fixed some of the bugs and updated it for Unity 5.6. Included you’ll find the updated version of TerrainEdge. If you encounter any bugs, please report them in this thread.
Known bugs / issues:
Fix Edges/Seams will mess up your terrain. For now I recommend using Terrain Stitcher instead.
Increasing resolution uses a bad upscaling algorithm. It’s still useful, but could be better.
Elevation values for texture generation are very inaccurate.
Here’s another bug: if you try to use the Splatmap Generator “Full Scene” option, you get an index out of range exception at line 1607 of TerrainEdge.cs. (and the generating window just sits there forever, not moving)