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Re:Slack may regret its letter to Microsoft by it33 on Thursday November 03, 2016 @05:21PM (#12868078)
Mattermost is an open source, self-hosted Slack-alternative: https://www.mattermost.org/what-slack-might-learn-from-its-o...
Re:Slack may regret its letter to Microsoft by oddvar on Friday November 04, 2016 @12:52PM (#12873993)
There is also Matrix (matrix.org), an open standard for decentralized communications. Our goal is to let all apps talk to each other - including Slack, Mattermost, and Microsoft Teams!

Check it out using any Matrix-enabled app: https://matrix.to/#/#matrix:matrix.org