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mattermost/mattermost

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

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What it does

Mattermost is a self-hosted team messaging and collaboration platform — think Slack, but one you run on your own servers — with built-in chat, workflow automation, voice calls, screen sharing, and AI features. It's designed specifically for software and security teams who need to keep sensitive communications under their own control rather than on a third-party cloud.

Why it matters

With over 35,000 stars and 1,100+ contributors, Mattermost represents a major market signal that enterprises — especially in regulated industries like defense, finance, and healthcare — are actively seeking Slack alternatives they can fully own and control. For founders and investors, it validates a durable business model around open-core software where the free version drives adoption while paid tiers and enterprise features generate revenue.

42Hot

Gaining traction — heating up

Stars
36.0k
Forks
8.5k
Contributors
1192
Language
TypeScript

Score updated Mar 26, 2026

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