NodeBB. It's a fairly popular webforum, but ActivityPub support is fairly new. It's really something else to see the Fediverse through a the lens of the old Internet.
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Misskey. It's not exactly niche, but it has a lot of cool features.
For example:
- Drive features to reuse your image or other media.
- Misskey games, so far only have Bubble Game and Go.
- Groups
- Antenna, basically subscription for any post with your set of rules.
- Playful profile decoration, similiar to Discord/Steam.
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https://codeberg.org/grunfink/snac2 and https://gotosocial.org/
The snac2 dev made it using only openssl and curl libraries. It doesn't even use a proper database, so it's very lightweight.
Gotosocial is basically mastodon but easier to set up on the server and lighter on resource usage.
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