Searching for a WordPress Theme / Plugin for multiple closed communities

Dear WordPress Community,
I am looking for a WordPress based solution to create multiple independent communities that would allow the members to interact with each other, see initiatives, vote on them. Members need to be approved by admins, and communities would not be seen between each other unless authorized.
Ideally, there would be overarching resources that would be available for multiple communities, or that all these communities can be part of an overarching community with broader topics that might be of the interest of all the sub-communities.

What solution would you think could offer a nice, simple and multilingual user experience?

Thanks for sharing your thoughts!


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