TerrainGenerator is the gameobject that generate the Terrain mesh according to the settings TerrainData, NoiseData and ColorData.

The GeneratedMesh is the actual mesh of the Terrain with it's mesh collider and material.

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The MiniMap is almost the same as GeneratedMesh but without applying the HeightMap or adding colliders. The MiniMapCamera creates render texture to display the MiniMap on the MainCamera. The MiniMapLight only affects the MiniMap.

The RuntimeModifCanvas object is the gameobject that enables TerrainRuntimeModification, instead of changing the settings from the Data Folder inside unity, TerrainRuntimeModification enables you to make a build and keep modifying the terrain settings.

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The ObjectSpawner spawns object on top of the terrain, it also spawn object at certain height only or certain amount of patches, like spawning corals underwater or forest clumps. 
The PathSpawner create procedurally generated path along the terrain to add flat collision. It can also spawn parkour structure with Parkour path.

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Electurch is one of my Goblimps, He has idle, walking, running, jumping and falling animations. 

The GrassSpawner spawns grass blades it uses the Grass Compute shader from MinionsArt. To make your object interact with the grass they need the ShaderInteractor.cs