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Mattermost

Open-source, self-hosted team messaging for secure environments.

↗ mattermost.com Listed May 31, 2026

About Mattermost

Mattermost is an open-source, self-hostable messaging platform built for security-conscious and technical teams. It offers channels, threads, and integrations with full control over data residency, making it popular in government, defense, and regulated industries.

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