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Re:Atlassian launches Stride, its Slack competitor by utobi on Thursday September 07, 2017 @10:33AM (#15192179)
It is possible to connect to Slack with an IRC client:

https://get.slack.help/hc/en-us/articles/201727913-Connect-t...

Re:Atlassian launches Stride, its Slack competitor by hueving on Thursday September 07, 2017 @11:57AM (#15193006)
That's still a proprietary backend.