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Re:Why Slack is inappropriate for open source communications by patrickg_zill on Tuesday April 11, 2017 @11:44AM (#14089065)
Mattermost is an open source alternative to Slack btw.

And Discourse is pretty great, though much more like a forum.

Re:Why Slack is inappropriate for open source communications by simopaa on Tuesday April 11, 2017 @11:49AM (#14089159)
We have been using http://rocket.chat at work and it works beautifully. Slack was never an option for it was not self-hostable
Re:Why Slack is inappropriate for open source communications by patrickg_zill on Tuesday April 11, 2017 @11:53AM (#14089212)
Also a good choice.