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This is a paid asset, but now you can download Terrain Former Free.
Terrain Former v1.7.11
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Terrain Former is an intuitive and simple terrain editor for Unity with support for multiple terrains, allowing for terrains suitable for even the biggest open world games.
– Full multi-terrain support—sculpt seamlessly across mutliple terrains.
– Flatten (with Bridge, Extend modes),
– Set Height,
– Paint Texture,
– Heightmap Importer, Heightmap Export to EXR,
– Mould (formerly Shrink Wrap),
– Generate—generate terrain that follows a curve (w/ linear and circular modes)
– Terrain Grid Creator Wizard,
– All tools work across terrain grids
Terrain Former addresses all of the major issues with Unity’s built-in terrain editor, such as the painfully slow smoothing tool and its constrained brush size.
Note: Details (rocks, grass, etc) and trees tools are planned but will be coming in a future release of Terrain Former. You can however in the meantime, easily switch between Unity’s terrain tools and Terrain Former.