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Re:How Skype fixes security vulnerabilities by mrbiber on Wednesday December 21, 2016 @06:27AM (#13228323)
Riot.im is almost there, together with e2e crypto, foss stack, server federation and bridges to slack, irc etc.
Re:How Skype fixes security vulnerabilities by mixedCase on Wednesday December 21, 2016 @04:28PM (#13232782)
Riot is a good alternative to IRC, Slack and other team/community chat systems.

It's not an option for the international 1 on 1 most Skype users are used to. The closest option seems to be Wire, but I've yet to try it.