I believe Discourse was planning things but decided to scrap them. The person behind PixelFed (a federated Instagram-like platform) hinted at a [forum platform](https://mastodon.social/@dansup/105425592966902917), but I have no idea if there's any progress on that.
And of course, there's [Lemmy](https://lemmy.ml/), which is kinda like Reddit, but federated.
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