Not the ‘community’ you enjoy the most but the free, as in beer, self hosted, free and open-source forum software used to run it, which could be an awful community with a fantastic software.
Ask HN: What’s your favourite gratis self hosted FOSS forum software, as a user?
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Re: Ask HN: What’s your favourite gratis self hosted FOSS forum software, as a user?
#2Not sure it's my favorite, bur definitely the most used: https://www.discourse.org/
A more recent alternative is https://flarum.org/