I don't know any, but Lemmy will be getting native support for multicommunities, thanks to NLnet.
https://join-lemmy.org/news/2024-09-11_-_New_NLnet_funding_for_Lemmy
this post was submitted on 02 Oct 2024
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There's an app called Loom that is supposed to do this as a major feature. It's still in an early dev stage though so still not super polished.