Our great sponsors
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decidim
The participatory democracy framework. A generator and multiple gems made with Ruby on Rails
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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phpBB
phpBB Development: phpBB is a popular open-source bulletin board written in PHP. This repository also contains the history of version 2.
Discourse is a Great fit for communities of all size (www.discourse.org) I personally use Discourse self hosted for friends & family which has no public access, only available on our local network and through VPN.
Maybe decidim? https://decidim.org/
The classic https://www.phpbb.com/ forum software has this functionality, including hidden forums that only certain user groups had visibility to.
My favourite forum software is https://flarum.org/ and IIRC it can be made private.