Now that people have moved from reddit to lemmy I'm glad to be using more FOSS software. Now all that's left is discord but I can't find a good replacement.

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[–] vipaal@aussie.zone 1 points 1 year ago

https://www.opensourcealternative.to/ lists rocket.chat as an alternative to Slack and Discord

I have not used it. I have used Mattermost. And it can do channels, teams, hashtags, @ mentions etc similar to Slack. Though it requires the server be hosted and administered by you or someone you know.