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Re:Open Sourcers Race to Build Better Versions of Slack by chei0aiV on Thursday March 17, 2016 @04:18AM (#11303111)
I think Telepathy was ahead of its time. Shame it didn't get much adoption outside of Nokia and is now on life-support:

http://telepathy.freedesktop.org/

Re:Open Sourcers Race to Build Better Versions of Slack by goffi on Thursday March 17, 2016 @12:30PM (#11305439)
You may want to check http://salut-a-toi.org/ then (I'm working on it), we have a similar architecture and it's a very active project, XMPP only though.