Blender 4.2 and newer. It is tested on Blender 4.2, 4.5 and 5.2 LTS.

The map is a grid of terrain chunks (64 m by default) and you can add more with Add Land. Brushes only update the chunks they touch and the grass is drawn only near the view, so editing stays fast on large maps.

No. The addon has its own brushes that work in Object Mode right from the sidebar: sculpting, landform stamps, biome paint, scatter paint and water paint.

Yes, in Unity through the built-in Unity Bridge: terrain tiles or LOD meshes, ground layers, trees, details, grass, wind, water, LOD groups and colliders are created in your open Unity project and kept in sync. It supports Unity 2021.3, 2022.3 and Unity 6. The generated foliage shaders target URP; other pipelines use their standard Lit material.

Yes. A library of stylized trees, bushes, rocks, boulders, flowers, reeds, cacti and dead wood for every biome ships inside the addon. Nothing else has to be installed.

EEVEE ray tracing shades the dense grass field too strongly. Switch off Ray Tracing in the render settings for the painted look.