Mattermost describes itself as zero-trust collaboration, automation and AI for private cloud, self-hosted and air-gapped environments, built for national security, critical infrastructure and regulated enterprises. The platform brings together secure messaging and collaboration, workflow automation, task management, sovereign AI agents, and real-time audio and screenshare, and states that every capability runs entirely inside your own perimeter, including on classified and air-gapped networks. Deployment choices cover sovereign cloud, on-premises and private cloud, fully disconnected installs, hybrid and multi-region setups, and lightweight edge deployments for ships and field bases, with integration frameworks, webhooks and a plugin architecture on top.
Mattermost
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Mattermost is an open-source collaboration platform built around zero-trust messaging, workflow automation and AI for organisations that need to keep control of their data. It can run on sovereign cloud, on-premises private cloud, fully air-gapped networks or hybrid deployments. Capabilities include searchable messaging across channels, threads and direct messages, workflow automation, task boards, audio and screenshare, sovereign AI agents, federation and classified-information controls.