Mattermost is an open source, private cloud, Slack-alternative from https://mattermost.com.

It's written in Golang and React and runs as a single Linux binary with MySQL or PostgreSQL. Every month on the 16th a new compiled version is released under an MIT license.

• Review product documentation.
• Review developer documentation.
• Download compiled version.

• Join the Mattermost Contributor's server (latest nightly builds, unstable)
• Join the Mattermost Demo server (latest stable version)

Note: Heroku preview does not include email or persistent storage

Auto-deploy Mattermost to Amazon Web Services, Azure, Google Cloud Platform, or Oracle Cloud Platform via Bitnami.

• One-line Docker Preview
• Developer Machine Setup
• Production Install Guides using Linux Binary
• Production Docker Install

In addition to the web interface, you can also download Mattermost clients for Android, iOS, Windows PC, Mac OSX, and Linux.

Receive notifications of critical security updates. The sophistication of online attackers is perpetually increasing. If you are deploying Mattermost it is highly recommended you subscribe to the Mattermost Security Bulletin mailing list for updates on critical security releases.

• Subscribe here

• Contribute Code
• Find "Help Wanted" projects
• Join Developer Discussion on a Mattermost Server for contributors
• File Bugs
• Share Feature Ideas
• Get Troubleshooting Help
• Help translate Mattermost

• API Options - webhooks, slash commands, drivers and web service
• See who's using Mattermost
• Browse over 700 Mattermost integrations

• Twitter - Follow Mattermost
• Blog - Get the latest updates from the Mattermost blog.
• Email - Subscribe to our newsletter (1 or 2 per month)
• IRC - Join the #matterbridge channel on Freenode (thanks to matterircd)

Any other questions, mail us at [email protected]. We’d love to meet you!