this post was submitted on 03 Feb 2026
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People suggest matrix but matrix really doesnt replace mattermost for an org.
mattermost is oriented towards org needs. It has boards, playbooks, better levels of access control. Admin panels etc.
We really need a sane Slack alternative that is at least fully free for self hosting.
It seems Zulip is the Slack alternative you wish for?
Zulip still has cuck licensing (permissive license). Same thing that happened to mattermost will happen to all permissively licensed projects.