I've Used Briar and It's a Really Promising Project

I'm pretty sure it's peer-to-peer no matter what I don't think there's any central service because everything's onion routed um but I mean it's not purely mesh like if you're in the western world like I downloaded briar and like I could chat with people on the other side of the world. There's no central server with briar so there's no messages being processed through any server it's just you directly communicating to another device over a tour. The UX is kind of oh yeah 100 percent yeah it's not great yeah and then there's someone mentioned session appUm I feel like it needs work yeah Polish wise I've used session nathan from the surveillance