Mattermost | Collaboration Platform for Mission Critical Work
Accelerate your mission critical workflow by integrating people, processes, tools and AI infrastructure on a resilient and adaptable platform.
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Mattermost is an open-source, self-hosted collaboration platform that provides secure messaging, workflows, and integrations for technical and mission-critical teams.
🚀 Overview
Mattermost is a secure, open-source alternative to Slack and Microsoft Teams, designed for teams that require full control over their communication infrastructure. It enables self-hosted deployments on-premises or in private clouds, ensuring data sovereignty, compliance, and resilience in high-stakes environments like defense, cybersecurity, and DevOps.
The project solves the problem of relying on SaaS tools that may lack security, availability during outages, or compliance with regulations like GDPR, HIPAA, or FIPS. It's built for developers, security operations centers (SOCs), incident response teams, and enterprises handling sensitive data.
Founded by former Slack engineers in 2015, Mattermost was created to deliver an open platform that accelerates mission-critical workflows with integrations, AI, and custom extensibility while maintaining operational sovereignty.
✨ Key Features
- Secure, threaded messaging with channels, direct messages, and file sharing (granular permissions, compliance auditing)
- Deep integrations with GitHub, Jira, PagerDuty, and 1,000+ apps; custom plugins and bots
- Playbooks for incident management, checklists, and automated workflows
- Real-time voice/video calling, screen sharing, Kanban boards, and AI-powered Copilot for summarization
- Upcoming: Enhanced federated comms, zero-trust security, and air-gapped support in Enterprise Advanced
🛠 Tech Stack
- Frontend: React, TypeScript, SCSS
- Backend: Go (Golang), single Linux binary
- Database: PostgreSQL, MySQL
- Cache: Redis
- Auth: SAML, OIDC, LDAP, MFA, custom
- Hosting: Self-hosted (Docker, Kubernetes, Helm), Mattermost Cloud (SaaS)
👥 Who Is This For?
This project is useful for:
- Developers who want to integrate chat with CI/CD pipelines and Git workflows
- Teams looking for compliant, self-hosted collaboration in regulated industries
- Indie makers building secure internal tools or open-source projects
📸 Screenshots / Demo
- Live demo: https://mattermost.com/sign-up (1-hour preview environment)
- GitHub: https://github.com/mattermost/mattermost
🔥 Project Status
- 🟢 Actively building
Last updated: 2026-03-24
❓ FAQ
Is this project free?
Freemium / Open Source Team Edition is free forever for unlimited users. Paid subscriptions (Professional, Enterprise) start from contact sales, offering advanced features, support, and scalability.
Is the source code available?
Yes — https://github.com/mattermost/mattermost
Can I contribute?
Yes — report issues, submit PRs on GitHub, contribute to plugins via mattermost-community org, join forums at forum.mattermost.com, or provide feedback on roadmap.
📬 Contact & Links
- Website: https://mattermost.com
- GitHub: https://github.com/mattermost
- Twitter/X: https://x.com/Mattermost
- Email: https://mattermost.com/contact-sales/
Built with ❤️ and kept warm on WarmIndex.
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