Phoenix has Phoenix Presence for managing the "Who's online" feature. We use replicated CRDTs to transparently manage the presence state across the cluster: htt

Phoenix has Phoenix Presence for managing the "Who's online" feature. We use replicated CRDTs to transparently manage the presence state across the cluster: https://dockyard.com/blog/2016/03/25/what-makes-phoenix-presence-special-sneak-peek https://dockyard.com/blog/2016/03/25/what-makes-phoenix-pres... As far as native platform clients, we have all major channel clients covered across community libs – Swift/objc/Java/C#