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mattermost

mattermost

Posted Feb 21, 2026 17:11 UTC (Sat) by marcH (subscriber, #57642)
In reply to: Rocket chat by sramkrishna
Parent article: Open-source Discord alternatives

I once used "mattermost" at $WORK and I was very, very impressed. While I'm not an "advanced" user, for me mattermost did everything Slack does and just as well. Certainly much better than MS Teams.

It was self-hosted at the time. It's apparently 100% open-source but please don't take my word for it.

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mattermost

Posted Feb 21, 2026 17:32 UTC (Sat) by dskoll (subscriber, #1630) [Link]

Yes, I like Mattermost quite a bit. I have a self-hosted instance for a few friends and me. That said, it's a bit of a nag and constantly tries to upsell you to the paid version. I guess I could build my own from source with the nagging removed, but that seems like a big hassle compared to downloading the pre-built binaries.

The Mattermost user experience is quite similar to Slack, but without Slack's anti-features.

mattermost

Posted Feb 23, 2026 8:22 UTC (Mon) by rnestler (subscriber, #160299) [Link] (1 responses)

I also used mattermost at a former employer. One nice thing is, that it is bundled with GitLab, so if you self-host GitLab it's very easy to just enable the mattermost server as well and integrating it with the user management of GitLab (https://docs.gitlab.com/integration/mattermost/).

We also use it in our Hacker- / Makerspace as the main communication tool and it works very well for us.

mattermost

Posted Feb 23, 2026 13:15 UTC (Mon) by ABCD (subscriber, #53650) [Link]

Unfortunately, Mattermost will no longer be bundled with GitLab as of 19.0 (which I believe is scheduled to be released in May 2026).


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