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This is a paid asset, but now you can download Smart Level Editor for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Smart Level Editor v2.1
Level Editor is an Extension Tool for Unity that lets you Create or Delete objects on your scene view with one click. It also allows for positioning, rotating and scale of multiple objects while snapping them. Level Editor allows you to create, design and edit your levels faster and precisely as you want while working in conjunction with unity default Tools. Documentation
Features
– Create
– Delete
– Move
– Rotate
– Scale
– Snap