Mattermost

Mattermost is a collaboration platform designed for mission-critical work, integrating people, processes, tools, and AI infrastructure on a resilient and adaptable platform. It is used by governments, enterprises, and militaries around the world for secure collaboration, workflow, and AI on sovereign infrastructure. Mattermost offers features such as channel-based messaging, file sharing, and link and file previews across device platforms. It also provides threaded discussions, core search, custom branding, themes, and emojis. Mattermost is deployed by leading organizations in mission-critical environments where failure is not an option.