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Mattermost is an open source, self-hosted Slack-alternative: https://www.mattermost.org/what-slack-might-learn-from-its-open-source-alternative/ https://www.mat

• oddvar 10y ago
  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 https://matrix.to/#/#matrix:matrix.org