Download Mattermost mobile and desktop apps and connect to an existing Mattermost server. Or deploy Mattermost on your own server.

Accelerate your mission critical workflow by integrating people, processes, tools and AI infrastructure on a resilient and adaptable platform.

Mattermost is an open-source, self-hostable online chat service with file sharing, search, and third-party application integrations. It is designed as an internal chat for organisations and companies, and …

Mattermost is the most mature self-hosted team messaging platform available in 2026. For organizations that need Slack-like functionality without giving up control of their data — particularly engineering …

------- Mattermost is the leading collaborative workflow platform for defense, intelligence, security, and critical infrastructure. The platform runs on-premises and in private clouds, delivering secure …

Requires Mattermost Server v10.11.0+. Older servers may not be able to connect or have unexpected behavior. ------- Mattermost is secure workplace messaging from behind your firewall. - Discuss …

From Mattermost v11.3, burn-on-read messages stay concealed until recipients reveal them. After revealing, the message is deleted for that recipient when the timer expires. Burn-on-read messages …

A Model Context Protocol (MCP) server for Mattermost, enabling AI assistants to interact with your Mattermost workspace. This server provides tools for sending messages, managing channels, …

1 day ago · Install Mattermost Team Edition on Ubuntu 26.04 with PostgreSQL 18, systemd, Nginx and Let's Encrypt. Covers SMTP, scaling path, mmctl.

Mattermost Channels provides secure, channel-based messaging, voice & video chat, collaboration, and file sharing to keep teams connected, aligned, and productive.