This is a paid asset, but now you can download Prefab Painter 2 Free.
Detail this asset from Unity Asset Store: Original Link
Prefab Painter v2.6 (Latest version)
Prefab Painter v2.2
“If possible, please buy the package to support the developer”
Prefab Painter is a tool for placing large amounts of objects on surfaces.
– Place/Erase/Select objects
– Precise place objects
– Place decals
– Align to Surface
– Align to Stroke
– Randomized scale
– Randomized rotation
– Paint on chosen layer
– Place on meshes without colliders
– Example assets to test