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"Slack’s biggest redesign ever tries to tame the chaos of your workday"
(www.theverge.com)
This is a most excellent place for technology news and articles.
So what's the alternative if this is no good? Is there a FOSS Slack?
Yes, there is https://mattermost.com/
I've used Ripcord before, and it was a bit janky but hellishly fast and light weight.