Mattermost
Unified workspace for secure team communication, workflow automation, and AI-powered collaboration with full data control and on-prem/cloud deployment options.
Mattermost is an open-source alternative to:
Mattermost is an open-source collaboration platform designed for mission-critical work environments where security, compliance, and operational sovereignty are paramount.
Key Features
- Secure Collaboration: End-to-end encrypted messaging with granular access controls and audit logging
- Mission-Critical Workflows: Built-in Playbooks for repeatable processes and incident response
- AI Integration: Enterprise-grade AI capabilities with agentic workflows and MCP support
- Multi-Domain Security: Air-gapped, on-prem, and private cloud deployment options
- Interoperability: Native integrations with Microsoft Teams, Atlassian, GitLab, and 1,000+ other tools
- Compliance Ready: SOC 2, HIPAA, FedRAMP, and ITAR compliant deployments
- Developer Tools: Built-in code review, CI/CD pipelines, and API-first architecture
- Global Trust: Deployed by governments, militaries, and Fortune 500 enterprises
Tech / Self-Hosting
Mattermost is available as both a cloud-hosted solution and self-hosted open-source software. The self-hosted version can be deployed on any infrastructure with Docker, Kubernetes, or bare metal installations. Supports PostgreSQL, MySQL, and enterprise-grade security configurations. Full documentation available at docs.mattermost.com.