Mattermost
OperationsOpen SourceTeam Communication
Open-source collaboration platform for mission-critical secure work.
About
Mattermost is an open-source, self-hostable collaboration platform designed for defense, intelligence, security, and critical infrastructure teams. It combines team messaging, file sharing, search, and third-party integrations with built-in LLM capabilities through Mattermost Agents. The platform powers over 800,000 workspaces globally and emphasizes security, resilience, and adaptability for mission-critical workflows.
Problem it solves
Provides secure, self-hosted team collaboration without relying on external cloud services for mission-critical organizations.
Best for
Defense, intelligence, security, critical infrastructure teams, and enterprises requiring self-hosted collaboration.