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Zulip is also open source and an alternative. It shares some of the same features as Mattermost. Mattermost seems to compete more directly with Slack; Zulip is more like IRC++. (For those from the MIT or CMU world, it's basically Zephyr with a web interface and a pile of features on top.)

Full disclosure: my company has been using Zulip since before it was F/OSS.



IRC die-hard here. Zulip is the only one of these Slack-like services I could ever see coming close to replacing IRC for me.


Can you explain how Zulip is more like a better IRC and Mattermost like Slack?

I'm a reluctant and weak (opposite of power) user of IRC and Slack and though I understand their great architectural differences, as a user they feel very similar. Surely I'm missing something.




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