aoshi11 you might be interested in these few links:
A paid add-on with a good starter set of furniture. You can also add your own if you organize your models accordingly.
The best asset manager I have found, can be made to work in 2.90 as well (read the thread towards the end its explained how).
A huge free asset library:
Blendswap. Lots of assets there too.
https://www.blendswap.com/
Blenderkit. A built in online asset library.
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