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There's Mattermost[1], which is an open source alternative to Slack. I haven't tried it yet so can't vouch for how it compares.

I had a lot of issues with mattermost delivering messages out of order and constantly getting disconnected with “retry” on lots of messages.

Not saying you’ll have the same issues, but definitely turned me off. :/

Mattermost CEO here,

Hi Dijit,

Highly appreciate the feedback. Definitely want you to have an amazing experience on Mattermost, and I'm sorry you're having issues.

If you go to "About" can you see which build you're running, whether it's a stable or unstable release?

Odd number releases are stable "Quality Releases", e.g. 5.17, even number releases are unstable "Feature" releases, e.g. 5.16.

Also, we probably need to add more diagnostics into our clients, as some issues come from how people choose to deploy the backend server.

> Odd number releases are stable [...], even number releases are unstable

Well, that's odd !