And in case @m0xie complains that we should call it the "Signal Protocol":

No one will call it that as long as you claim that Signal is trademarked, and threaten legal action against projects using that name.

The LibreSignal issue, where you behaved worse than a kindergarten child (and I know, I volunteered to work some weeks in a kindergarten a few years ago) is still in memory for most people.

Given that it's not multiplatform it's kind of irrelevant. It's not a replacement for any of the others. I mean, yay for better encryption, but it's not going to help anyone on Whatsapp today.