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Mattermost

Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).

Description from awesome-selfhosted (CC BY-SA 3.0)

Still maintained? Yes: 716 commits in the last 90 days, latest release v12.0.1 (Oct 2026).

Also an alternative to Slack, Microsoft Teams and Discord.

Docker #3 of 44 in Communication - Custom Communication Systems

At a glance

Mattermost quick facts

Health score
98/100 GOOD
Stars
39,469
Last commit
today (Oct 2026)
Latest release
v12.0.1, Oct 2026
Licence
⊘ Proprietary
View mattermost/mattermost on GitHub ↗ Website ↗

Top alternatives to Mattermost

Full rankings: Slack alternatives, Microsoft Teams alternatives, Discord alternatives

In its own words

The project's README opens: "Mattermost is an open core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th."

Why it ranks here

Health score explained

Mattermost scores 98/100, #3 of 44 in Communication - Custom Communication Systems: 716 commits in the last 90 days earn 35.0 of 35 points, the latest release (v12.0.1, 8 days ago) earns 25.0 of 25, 39,469 stars add 18.4 of 20, an active, unarchived repository keeps 10 and Docker support adds the final 10. That places it in the good band (70 and above). The biggest shortfall is star count, worth 1.6 more points.

Recomputed nightly from the GitHub API. How the score is calculated.

  • Commit activity 35.0 / 35

    716 commits in 90 days (30+ scores full marks)

  • Release recency 25.0 / 25

    v12.0.1 released 8 days ago

  • Stars biggest shortfall 18.4 / 20

    39k stars on GitHub (logarithmic)

  • Not archived 10.0 / 10

    Repository is active

  • Docker support 10.0 / 10

    Docker image or Compose file available

Commit activity

2170 commits over the last 12 months
716
Last 90 days
2,170
Last 12 months
today
Last push

Ranked #3 of 44 tools in Communication - Custom Communication Systems by health , between Chatwoot (#2) and Novu (#4) .

Details

Licence⊘ Proprietary
PlatformsGo, Docker, K8S
Latest releasev12.0.1 · 8 days ago
Stars39,469
Open issues627
DockerYes
Repositorymattermost/mattermost ↗
Visit website ↗ Source code ↗

Mattermost vs its top 5 alternatives

Active tools that share a comparison page or a category with Mattermost (Communication - Custom Communication Systems), scored on the same five terms.

Tool Health Stars Licence Last commit
Rocket.Chat 99 46k MIT today
Chatwoot 98 39k ⊘ Proprietary today
Mattermost (this tool) 98 39k ⊘ Proprietary today
Zulip 88 26k Apache-2.0 today
Element 87 14k Apache-2.0 today
Tinode 87 14k GPL-3.0 5 days ago

Mattermost: common questions

What does Mattermost replace?

Repoly lists Mattermost as an open-source alternative to Slack, Microsoft Teams and Discord. Each comparison page ranks every alternative by the same health score, so you can see where Mattermost stands against the others.

Is Mattermost still maintained?

Mattermost had 716 commits in the last 90 days and its last push was today; the latest tagged release, v12.0.1, is from 8 days ago. Repoly recomputes this nightly.