[hkjayakumar]

Mattermost[1] is an existing open-source[2] Slack alternative.

[1] https://about.mattermost.com/

[2] https://github.com/mattermost

[locusofself]

I have a few dozen mattermost deployments I maintain. It's great.

[darksim905]

Except they don't have an app you can install on your phone/desktop/laptop, last I checked. If I could also join a 'Mattermost' team from the Slack app so everything is centralized, I'd be happy as fuck.

[vith]

Looks like they do: https://about.mattermost.com/download/#mattermostApps

[darksim905]

this is neat! thanks, this wasn't a thing a year or so ago. Now if only I can figure out if I can add Slack teams without fucker or the reverse.