Download Prefab Painter 2 FREE Unity. 

Prefab Painter is a tool for placing large amounts of objects on surfaces.

Features:
– 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
– Grouping
– Undo/Redo
– Example assets to test