Another interesting option https://holesail.io/

I’m testing syncing, notification and battery usage now on a few devices to see how it behaves. So far, so good. It also lets you specify which type of user you are inviting, so that admins does the heavy lifting

My bad, on the Pears homepage it says “Join the open-source P2P revolution”, so I assumed that was the case.

Someone asked the same question in the community group chat. Seems like the UI for Keet is closed atm, the rest is open.