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Jon Ericson[1] is working on pretty much what you asked for. It seems to be Discourse with a different base configuration that emails collaborators by default. There is a free open Beta for small c...
Answer
#2: Post edited
Jon Ericson, formerly of Stack Exchange, [is working on](https://jlericson.com/2024/01/05/popup_communities.html) pretty much what you asked for. It sounds like there's a (free) open Beta for small communities. It seems to be Discourse with a different default configuration.
- Jon Ericson[^jon] [is working on][2] pretty much what you asked for. It seems to be [Discourse][] with [a different base configuration][3] that emails collaborators by default. There is a free open Beta for small communities.
- [^jon]: Formerly of Stack Exchange, and [occasional contributor][1] here at Codidact.
- [1]: https://meta.codidact.com/users/8113
- [2]: https://jlericson.com/2024/01/05/popup_communities.html
- [discourse]: https://www.discourse.org/
- [3]: https://meta.discourse.org/t/seeking-help-getting-email-notifications-to-work-when-a-new-topic-has-been-added-to-specific-categories/290098/4?u=jericson