IRC, XMPP, any number of Discord/Slack clones that can run on-site, even Mastodon will use LDAP/PAM auth.

Stop using Slack for your business.

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@r000t The problem here is that a purely internal communications platform is of limited use - you want to have third party project contacts in there, and they in turn don't want to run a client for each customer.
There's also the dependency on your own infrastructue - how do you communicate when your own systems are in trouble, and you can't authenticate to the chat service?

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