I'm still working on Habitat. It's a free and open source, self-hosted platform for communities to discover and discuss their local area. The plan is for it to be federated, but that's a while off yet.
Would be interesting to see a location-based Polymarket site. Would be great to get a feel for any one spot and what's on people's minds via their predictions related to that particular location. Powerful instrument for change too as observers interact with the observed.