Hello; are there any addons/tools for easy placing/adjusting small items in large environments?

For example, if I wanted to put stacks of books, sheets of paper, water bottles, etc on the countertop or small crates or knick knacks on the floor.

Use the asset browser/ asset libraries in blender for that.
If you dont know it just search for it on youtube.

https://docs.blender.org/manual/en/latest/editors/asset_browser.html

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You can use Shift + Right Click, over a location, which will snap the cursor to that location, then when you add the asset it will be placed there ( make sure that the asset has its origin on the bottom face)

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Try this addon

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Good tip, thank you!

Grabbed it, thank you!

Learning the ropes on this! Thank you!