HyperKitty is probably the best example...

https://docs.mailman3.org/projects/hyperkitty/en/latest/

CH.
________________________________
From: Nnagain <nnagain-bounces@lists.bufferbloat.net> on behalf of David Lang via Nnagain <nnagain@lists.bufferbloat.net>
Sent: Wednesday, October 4, 2023 11:41 AM
To: dan via Nnagain <nnagain@lists.bufferbloat.net>
Cc: David Lang <david@lang.hm>
Subject: Re: [NNagain] forums?

On Tue, 3 Oct 2023, dan via Nnagain wrote:

> mailing lists are fun... but this would be so much better in forums IMO.

There are tools that will show you mailing lists in forum format, use them if
you like, but I find them very inferior to mailing lists.

David Lang