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Riot has everything Slack does, but it's more competent and free. And obviously the main selling point is compatibility with all kinds of other chats.

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>Riot has everything Slack does

Gitlab integration?

Yes, of course. But unlike Slack you are not limited to "official" "integrations", you can add arbitrary widgets and can write your own.

At my workplace we use Rocket.chat and it does have GitLab integration, so there's another possible alternative.

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