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Re:NYC Mesh – community-owned network to replace your curren... by culiuniversal on Tuesday August 28, 2018 @05:29PM (#17863076)
Also,

riot.im

Mattermost

Zulip

Wire

Rocket.chat

and more here: https://alternativeto.net/software/slack/

Re:NYC Mesh – community-owned network to replace your curren... by nerdponx on Tuesday August 28, 2018 @05:35PM (#17863111)
Riot.im is a Matrix.org client.

Mattermost is nice but it's not federated and I don't think it will catch on as a "public-facing" chatroom option. It's a nice solution inside an organizations that doesn't want to pay for Slack. I haven't used Rocket.chat but it looks similar along those lines. Wire just doesn't seem like the right solution.