Mattermost

Mattermost is an open core collaboration platform designed to accelerate mission-critical work. Built for the complex environments of defense, intelligence, security, and critical infrastructure organizations, Mattermost aims to ensure focused, adaptable, secure, and resilient collaboration that keeps teams connected when the stakes are highest. It supports real-time communication, file and code snippet sharing, in-line code syntax highlighting, and workflow automation purpose-built for technical teams.

By providing complete data control, deployment flexibility, and customizable integration with essential tools, Mattermost helps organizations to keep their mission in motion.