[Mattermost](https://mattermost.com) is an open source platform for secure collaboration across the entire software development lifecycle. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React and runs as a single Linux binary with MySQL or PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
[Use it for free in Mattermost Cloud](https://mattermost.com/sign-up/?utm_source=github-mattermost-server-readme) or [deploy on-premises](https://mattermost.com/deploy/?utm_source=github-mattermost-server-readme).
- [Product documentation](https://docs.mattermost.com/) - Learn how to run a Mattermost instance and take advantage of all the features.
- [Developer documentation](https://developers.mattermost.com/) - Contribute code to Mattermost or build an integration via APIs, Webhooks, slash commands, Apps, and plugins.
- [Download and Install Mattermost Self-Hosted](https://docs.mattermost.com/guides/deployment.html) - Deploy a Mattermost Self-hosted instance in minutes via Docker, Ubuntu, or tar.
- [Get started with Mattermost Cloud](https://customers.mattermost.com/cloud/signup) to use Mattermost instantly.
- [Developer machine setup](https://developers.mattermost.com/contribute/server/developer-setup) - Follow this guide if you want to write code for Mattermost.
In addition to the web interface, you can also download Mattermost clients for [Android](https://mattermost.com/mattermost-android-app/), [iOS](https://mattermost.com/mattermost-ios-app/), [Windows PC](https://docs.mattermost.com/install/desktop-app-install.html#windows-10-windows-8-1), [macOS](https://docs.mattermost.com/install/desktop-app-install.html#macos-10-9), and [Linux](https://docs.mattermost.com/install/desktop-app-install.html#linux).
Receive notifications of critical security updates. The sophistication of online attackers is perpetually increasing. If you're deploying Mattermost it's highly recommended you subscribe to the Mattermost Security Bulletin mailing list for updates on critical security releases.
- [Join Developer Discussion on a Mattermost server for contributors](https://community.mattermost.com/signup_user_complete/?id=f1924a8db44ff3bb41c96424cdc20676)
- **Email** - Subscribe to our [newsletter](https://mattermost.us11.list-manage.com/subscribe?u=6cdba22349ae374e188e7ab8e&id=2add1c8034) (1 or 2 per month).
[Join the Mattermost Contributors server](https://community.mattermost.com/signup_user_complete/?id=codoy5s743rq5mk18i7u5ksz7e) to join community discussions about contributions, development, and more.