Innis
Sebastix
You have to build it wrong first, before getting it right. There is no right without the wrong. Building it right is hard. Very hard. Just use OTR... The problem of unstoppable, private group messaging is SO much bigger and SO much harder than anyone gives it credit for (including me). There are many shortcuts. There are many half-baked solutions that might get short-term adoption. Building the thing right has pushed me to the limit many times over the last few years. And yet, I'm still here. Still learning, still building. I'm not going to give up, and I'm not going to cut corners.
Gigi
JeffG
Just use Signal protocol...
Just use a server...