Mattermost

Mattermost is a secure and flexible collaboration platform designed for mission-critical work environments in industries such as defense, government, and critical infrastructure. It offers features like integrated security operations, out-of-band incident response, self-sovereign collaboration, real-time DevSecOps, and purpose-built collaboration hubs. Mattermost is known for its adaptability and resilience, allowing deployment in on-premise or cloud environments with a focus on strict security, privacy, and compliance requirements. It serves organizations that require robust communication and collaboration tools with complete control over data. Among its notable customers are the USAF, Fujitsu, and CERN.