Mattermost is an open source, on-prem Slack Alternative

Mattermost modernizes team communication without locking in your data to a single provider.

Offer your end users messaging and file sharing across PCs and phones with archiving and instant search--without losing control of your data.

Features

Sharing Messaging and Files

• Send messages and comments across public, private and 1-1 channels
• Personalize notifications for unreads and mentions by channel and keyword
• Share files and images internally and externally

Archiving and Search

• Search archives across channels for historical messages and comments
• Use #hashtags to tag and recall messages, threads and files
• View recent mentions of your name and custom search terms

Anywhere Access

• Use Mattermost from web-enabled PCs and phones
• Attach sound, video and image files from mobile devices
• Define team-specific color themes across your devices

Learn More

• Product Vision and Target Audiences - What we're solving and for whom are we building
• Mattermost Forum - For technical questions and answers
• Issue Tracker - For reporting bugs
• Feature Ideas Forum - For sharing ideas for future versions
• Contributuion Guidelines - For contributing code or feedback to the project

Follow us on Twitter at @MattermostHQ.

Installing Mattermost

Depending on your needs, there are multiple ways to install Mattermost:

Product Evaluation

• Local Machine Install and Upgrade with Docker - Explore product functionality using a single-container Docker install on a local machine, including Mac OSX, Ubuntu, or Arch Linux). Optionally set up email and upgrade your instance using DockerHub.

• AWS EBS Install and Upgrade with Docker - Explore product functionality using a single-container Docker install for Amazon Web Services Elastic Beanstalk. Optionally set up email and upgrade your instance using DockerHub.

Development

• Developer Machine Setup - Setup your local machine development environment using Docker on Mac OSX or Ubuntu.

Production Deployment

• GitLab Mattermost Production Installation - Install Mattermost for production environments bundled with GitLab, a leading open source Git repository, using an omnibus package for Ubuntu 12.04, Ubuntu 14.04, Debian 7, Debian 8, and CentOS 6 (and RedHat/Oracle/Scientific Linux 6), CentOS 7 (and RedHat/Oracle/Scientific Linux 7).

Any issues at all, please let us know on the Mattermost forum at: http://forum.mattermost.org