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Isn't Mattermost pretty close? When I moved to a company with Slack, I recognized a lot of stuff from my previous job where some of the devs used Mattermost.

zulip has quite a few integrations too apparently.

I've been thinking about giving zulip a whirl with one of our smaller teams at work, and see how it compares to slack. Quite a few items on the "why zulip?" page really resonate with me.

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