Mattermost is the secure, sovereign collaboration platform built for mission-critical operations. Trusted by defence, intelligence, and critical infrastructure teams, it powers high-stakes workflows, from incident response and cyber defence to mission planning, across DDIL, tactical, and enterprise environments. With on-prem and private cloud deployment, workflow automation, and AI-accelerated capabilities, Mattermost delivers full operational control and reduced mean time to action in even the most demanding conditions.