Permap is an open source geo-message-board software written in OCaml.
Permap was initially made to be a gardening/permaculture forum. Permap's aim is to help people find friends with similar interests around them and build local communities.
You can make threads with geographical coordinate, this way you can find people near you doing interesting things, socialize with them and share local knowledge.
Make permap federate
More than coordinates
Make threads on anything with a geographical position. Instead of making threads with a simple (latitude * longitude) data, we want to be able to make threads on any OpenStreetMap's item/ActivityPub object that can resolve to a geographical position.