Wire (https://wire.com/) is end-to-end encrypted, based on Signal protocol. It's open-source and cross-platform with mobile apps. I've been using it instead of Skype for two years and I don't regret that decision.
You meet a random person and wish to connect on a chat/presence system - that is what I mean by "beyond team communications". Acceptability of such a system for that purpose either requires overwhelming adoption of a single provider (Whatsapp, Facebook Messenger) or federation (SMS, SMTP, XMPP back when Google had not yet killed it). Team communications does not suffer that acceptability requirement because tooling is hierarchically mandated.
I've been eying Wire for the interface and ease of installation. In terms of looks and handling it seems like one of the best options to hand to people with little technical interest/aptitude/patience.
Moxie Marlinspike has commented that Wire does not use the Signal Protocol but only took some components from it and created their own protocol, which he did "not recommend"
https://news.ycombinator.com/item?id=12690148
Has there been any changes to that situation?
