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The secure, self-hosted collaboration platform for defense, intelligence, security, and critical infrastructure organizations. Documentation for operators, administrators, end users, developers, and the compliance team.
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Mattermost is an Intelligent Mission Environment (IME), purpose-built for mission-critical operations. It delivers a unified platform for secure, extensible, AI-powered collaboration and automation, deployable across the most demanding environments—from classified networks to the tactical edge. Organizations use Mattermost to maintain full control over communications, workflows, and infrastructure while accelerating decision-making.
IME integrates secure messaging, workflow automation, task management, agentic AI, and real-time communication within a sovereign, cyber-resilient architecture. It supports extensibility through open APIs and integrations, and runs flexibly across on-premises, cloud, and air-gapped systems—enabling operational focus, adaptability, and resilience from edge nodes to centralized data centers.
<IMEDiagram />It is designed to meet the evolving needs of national security, defense, intelligence, cybersecurity, and critical infrastructure sectors for mission-critical workflows, including:
See the Use Case Guide to learn how operational teams use Mattermost to accelerate mission-critical work across a wide variety of disciplines.
Built on an extensible open-core architecture, Mattermost offers an array of collaborative tools across managed Windows, Mac, or Linux desktop applications, secure web browsers with or without internet access, bring your own device (BYOD) or mobile device management (MDM)-managed mobile, and embedded Microsoft 365 user experiences.
Mattermost Channels enables secure, real-time and asynchronous communication across web, desktop, and mobile—powering mission-critical collaboration and Chat Operations (ChatOps) workflows across connected, hybrid, and air-gapped environments. Channels feature the following capabilities:
See the Client availability documentation to learn which features are available on different Mattermost clients.
Mattermost Playbooks standardizes and automates mission workflows such as incident response, shift changeovers, and operational checklists—reducing human error and improving procedural consistency. Playbooks feature:
Mattermost Calls enables real-time communication and troubleshooting through sovereign audio calling and screen sharing—supporting secure knowledge transfer and fast response in time-sensitive scenarios. Key capabilities include:
Mattermost Boards enables you to coordinate operational work with Kanban-style planning that integrates directly into messaging workflows—enabling transparency, prioritization, and accountability across teams with the following capabilities:
Mattermost Agents accelerate decisions and streamline repetitive tasks with AI-driven assistance, fully controllable within sovereign infrastructure—offering intelligent support for both users and workflows:
The Intelligent Mission Environment (IME) is built for secure, extensible integration with mission-critical systems and AI workflows. Designed to operate in sovereign, regulated, and disconnected environments, IME supports modular automation, multi-agent orchestration, and the secure deployment of both local and cloud-based AI models—enabling faster decision-making while maintaining full control over data, infrastructure, and model behavior.
Built to integrate securely with complex enterprise and mission-critical environments, this model enables teams to tailor workflows, automate operations, and connect to external systems using open standards and modular components—supporting rapid deployment of automation while maintaining flexibility and compliance across both air-gapped and connected environments.
Key capabilities include:
Learn more in our Integrations Guide.
A secure, extensible foundation for integrating multiple large language models (LLMs) and autonomous agents within a sovereign control plane enables organizations to operationalize AI within sovereign infrastructure—fusing data across systems, accelerating decisions, and maintaining full control over AI model access and performance. Organizations can leverage the following capabilities to operationalize AI:
The Intelligent Mission Environment (IME) is engineered for resilient, mission-critical operations—whether at the tactical edge, inside sovereign data centers, or across regulated cloud environments. Built on Kubernetes and designed for high availability, IME ensures continuity, scalability, and full operational control across diverse infrastructure profiles.
IME runs on lightweight, ruggedized, or mobile infrastructure, optimized for disconnected, denied, intermittent, and limited (DDIL) conditions.
For high-security environments requiring full infrastructure control, IME supports scalable, highly available deployment within sovereign datacenters.
IME is deployable across major cloud providers with support for hybrid and sovereign architectures:
Mattermost provides mission-critical teams with a sovereign, extensible, and AI-integrated collaboration platform designed for secure operations across the most challenging environments. Talk to an Expert to explore how to architect your Intelligent Mission Environment.