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Mattermost
Last discussed Sep 25, 2026
An open-source messaging and collaboration platform designed for teams and organizations.
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What creators say
This Week in Startups
mentioned
Used for: Open-source self-hosted team messaging
vs: Compared to Ando as an open-source precedent that never took off due to pricing
"There is an open-source version — Mattermost. But Mattermost still charges a lot so it's open source but there's a hosted version. It never took off."
More from This Week in Startups →+1 more mention from This
"if we use Mattermost instead of Slack, we can set it up this weekend, you can export everything from Slack."
Behind the Scenes with an early OpenClaw contributor! | E...
· Feb 26, 2026
JC
Jason Calacanis
mentioned
"Oh, it's an open source project. I can spin it up this weekend. Export your Slack instance and put it there."
More from Jason Calacanis →About this data
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