Trillian! It was nice to use a single client for ICQ, MSN and others. Universal availability and plain one-to-one & group chat removes most of the issues. Less

Trillian! It was nice to use a single client for ICQ, MSN and others. Universal availability and plain one-to-one & group chat removes most of the issues. Less important to support things like file transfer, voice chat, etc. Who could combine Skype, WhatsApp, FaceTime, Hangouts, Discord, Microsoft Teams/Skype for Business, etc. and do it in such a fashion I can trust it. Damn, I don't like government regulation, and when it comes to chat I'm frankly scared — I don't think they could resist the urge of adding backdoors in the process. But who else could put some pressure on the vendors to get these things to interoperate?