I've been working on Habitat for the past two years. It all stemmed from this idea that I posted in April 2024.
Habitat is a free open-source, self hosted social platform for local communities. It is aimed at fostering local community discussions and discovery of areas of interest. This is why it is built primarily around location. A Habitat instance centers on a specific area, and the local community can make generic posts about that area, or they can make posts about specific locations in that area. More about what I've been building and the future plans here.
Features
- Habitat specification of location and size - enabling posts related to the local area
- Home feed - Displays the most recent posts
- Nearby feed - Displays posts sorted by proximity to the user
- Create posts - Upload photos, set locations, comments
- Categories - Location rules
- Amazon S3 image storage option
- Personalisation - Overrides Habitat defaults per user: kms/miles, hidden categories
- Moderation tools - User, post, comment moderation, block email addresses
- Announcements - Scheduled announcements
- Public moderation log - Keep moderator actions visible for 30 days
If you're interest in this at all, please give it a spin and let me know how you get on. I'll keep an eye here on Lemmy, but you can also post to the Habitat discussion board on GitHub.
integrate it with #flohmarkt (and the fediverse in general) and you don't need to reinvent the wheel :-)
Keep in mind that OP's project is already based on a different protocol than the Fediverse for their own reasons. Trying to create and maintain a bridge between different protocols might be more work than to just make modifications to posts in the current system.
Other factors are end user experience and branding. Keep in mind that the average Facebook/NextDoor user isn't tech-savvy, and could also be put off by the weird software names commonly found in the Fediverse
It's likely worthwhile for OP to look into flohmarkt, but integration might not be the optimal method