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Mattermost

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An open-source messaging and collaboration platform designed for teams and organizations.

collaboration open source messaging team communication
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Jason Calacanis

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Jason Calacanis mentioned ✓ High confidence
"Oh, it's an open source project. I can spin it up this weekend. Export your Slack instance and put it there."
From: Software Stocks Implode, Claude's Hit List, State of the Union Reactions, Trump's Tariff Pivot • ▶ 29:01 • Feb 2026

Attribution: Jason's AI agent suggested Mattermost as an open-source alternative to Slack