Karrot is a free and open-source tool for grassroots initiatives and groups of people that want to coordinate face-to-face activities on a local, autonomous and voluntary basis.
It is designed in ways to enable community-building and support a more transparent, democratic and participatory governance of your group.
Interesting. I tried to use mobilizon which I think is activitypub-based but has somehow similar goals as Karrot. Karrot looks a bit lighter/snappier to use, which is good (but TBF it’s been a while since I haven’t given Mobilizon a try, maybe it got better since last time I tried).
They recently explained the difference here: https://fosstodon.org/@karrot/112225634228726754