Mattermost
Secure, self-hostable collaboration
Mattermost is an open-source, self-hosted collaboration platform that combines secure messaging, workflow automation, task management, and AI agents for teams operating in private cloud, on-premises, or air-gapped environments. It addresses the need for organizations to retain full ownership of their data, models, and encryption keys while coordinating real-time operations, incident response, and mission-critical workflows.
Core modules include Channels for messaging and file sharing, Calls for audio and screenshare, Playbooks for checklist-driven workflow automation, Boards for task management, and Agents for multi-LLM AI integration with an agent control plane. It connects to tools such as GitHub, GitLab, Jira, ServiceNow, and PagerDuty through plugins, REST APIs, webhooks, and an MCP server, and offers embedded interoperability with Microsoft Teams. Desktop apps cover Windows, macOS, and Linux, with mobile apps for iOS and Android. Security features include role-based and attribute-based access control, SSO, MFA, Active Directory and LDAP provisioning, retention policies, and compliance exports.
Mattermost is packaged in three editions: Professional, Enterprise, and Enterprise Advanced, with a limited-use free plan of Enterprise Advanced available for technical evaluation. It targets security-conscious teams in national security, government, critical infrastructure, financial services, and technology sectors that require self-hosted or air-gapped deployment.
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