Slack Alternatives
Discussions recommend open-source and self-hosted alternatives to Slack, such as Mattermost, Rocket.Chat, Zulip, and Matrix, for team communication, often highlighting self-hosting options and comparisons to proprietary tools.
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have you considered rocket chat? It's a slack you can either have hosted for you, or host in house.
Have you considered mattermost ?
Have you tried Mattermost? I've never used it but it looks like it might work for you.https://mattermost.com/
There are alternatives, like Zuliphttps://zulipchat.com/
So use Rocket.chat or Mattermost
Mattermost, anyone? Its a libre Slack replacement, with additional functionalities.
Why not Mattermost?http://www.mattermost.org/
Rocket Chat is a possible alternative. Also Teams and Discord.
Zulip is much better alternative due it it's threaded nature and it have nice slack import tool. Please give a try.
I think Mattermost might fit the bill?