Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. (by mattermost)

Mattermost Alternatives

Similar projects and alternatives to Mattermost

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better Mattermost alternative or higher similarity.

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Reviews and mentions

Posts with mentions or reviews of Mattermost. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-11-24.
  • What are the REST API reference projects that can be used as a guide in 2021?
    10 projects | | 24 Nov 2021
  • Schleswig-Holstein wechselt mit 25.000 PCs zu LibreOffice
    1 project | | 20 Nov 2021
  • Installation via Docker-Compose - Can't get it to work
    3 projects | | 13 Nov 2021
    version: "3" services: db: build: db read_only: true restart: unless-stopped volumes: - ./volumes/db/var/lib/postgresql/data:/var/lib/postgresql/data - /etc/localtime:/etc/localtime:ro environment: - POSTGRES_USER=mmuser - POSTGRES_PASSWORD=mmuser_password - POSTGRES_DB=mattermost # uncomment the following to enable backup # - AWS_ACCESS_KEY_ID=XXXX # - AWS_SECRET_ACCESS_KEY=XXXX # - WALE_S3_PREFIX=s3://BUCKET_NAME/PATH # - AWS_REGION=us-east-1 app: build: context: app # uncomment following lines for team edition or change UID/GID args: - edition=team # - PUID=1000 # - PGID=1000 # - MM_VERSION=5.31 restart: unless-stopped volumes: - ./volumes/app/mattermost/config:/mattermost/config:rw - ./volumes/app/mattermost/data:/mattermost/data:rw - ./volumes/app/mattermost/logs:/mattermost/logs:rw - ./volumes/app/mattermost/plugins:/mattermost/plugins:rw - ./volumes/app/mattermost/client-plugins:/mattermost/client/plugins:rw - /etc/localtime:/etc/localtime:ro # When you want to use SSO with GitLab, you have to add the cert pki chain of GitLab inside Alpine # to avoid Token request failed: certificate signed by unknown authority (link: # - /pki_chain.pem:/etc/ssl/certs/pki_chain.pem:ro environment: # set same as db credentials and dbname - MM_USERNAME=mmuser - MM_PASSWORD=mmuser_password - MM_DBNAME=mattermost # use the credentials you've set above, in the format: # MM_SQLSETTINGS_DATASOURCE=postgres://${MM_USERNAME}:${MM_PASSWORD}@db:5432/${MM_DBNAME}?sslmode=disable&connect_timeout=10 - MM_SQLSETTINGS_DATASOURCE=postgres://mmuser:[email protected]:5432/mattermost?sslmode=disable&connect_timeout=10 # in case your config is not in default location #- MM_CONFIG=/mattermost/config/config.json web: build: web ports: - "4000:80" - "4443:443" read_only: true restart: unless-stopped volumes: # This directory must have cert files if you want to enable SSL - ./volumes/web/cert:/cert:ro - /etc/localtime:/etc/localtime:ro cap_drop: - ALL
  • Open Source
    1 project | | 12 Nov 2021
  • Tell me any app, and I respond an open source alternative.
    12 projects | | 12 Nov 2021
    Mastodon, Linux, PeerTube, Nextcloud, Mattermost, Signal, Telegram, Element and XMPP.
  • Use forums rather than Slack/Discord to support developer community
    20 projects | | 8 Nov 2021
    So what's everyone's favourite forum software? Which of the many packages out there would actually be suitable to replicate the usability of Slack/Discord, without making all of the messages disappear like in a black hole?

    1) Discourse:

    Looks pretty modern and also offers managed instances if you'd like, but i can't help but to feel that it's pretty JS heavy and there is perhaps too much whitespace, which makes navigating longer threads somewhat cumbersome. To me, it seems like a case of UI > UX, which is an upsetting trend that i've noticed ("make something pretty rather than something functional").

    2) Flarum:

    This one is perhaps a bit better in my eyes as far as the UX is concerned and seems to have actually been developed as a mobile first forum. It does have that modern look while at the same time being reasonably functional, and the idea of putting the forum structure tree in the sidebar actually works pretty well!

    3) phpBB:

    Personally, this is my favourite from the "traditional" forum software, since it's really usable, it keeps a good information density, doesn't lose usability and isn't as JS heavy as any of the other alternatives. Also, there are plenty of plugins and even the default functionality provides you with most of the things that you'd like in a piece of forum software and the hardware requirements are pretty low.

    As someone who runs a phpBB forum or two myself, the biggest pain is perhaps updating, since you run into the very same issue of never knowing whether an update will break something or not and you might have to manually alter some config files if things go sideways. Also, admittedly, the admin UX could be better, but i guess that's just the software showing its age.

    That said, old is not necessarily always worse.

    4) Simple Machines Forum:

    To me, it looks like a slightly simpler alternative to phpBB, with similarly good readability, slightly lower information density, but overall a very similar look and feel to phpBB. Can't talk much about its features, but some people have recommended it in the past.

    Also, in regards to the free plan memory limitations, has anyone here experimented with self-hosted IM solutions? Personally i'm running a Rocket.Chat ( instance which seems pretty nice and functional, for example, for a smaller software developer team, though others also have had good experiences with Mattermost ( or other software.

  • Ask HN: Who is hiring? (November 2021)
    31 projects | | 1 Nov 2021
    Mattermost | Open source | Remote | Mattermost is a flexible, open source messaging platform that enables secure team collaboration. Try out Playbooks for Incident Collaboration and Focalboard for open source project management

    We are currently hiring:

    - Senior Engineering Manager- Cloud

    - Senior Full Stack Engineer - Playbooks Team

    - Full Stack Engineer - Channels Team

    - Senior React Native Engineer

    - Business Development Representative, UK

    - Business Development Representative, Germany

    - Senior Developer Advocate

    - Solutions Engineer

    - Senior Solutions Marketing Manager

    Please submit your application here: or send your resume to [email protected]

    To learn about all the ways to get involved with our community visit

  • Mattermost-Server Release v6.0.0
    1 project | | 12 Oct 2021
  • Does anybody else get logged out of Mattermost after a day?
    1 project | | 5 Oct 2021
  • Team Communication Software
    2 projects | | 23 Sep 2021
    I think Mattermost ticks most, if not all, boxes.
  • Show HN: Motion One, the Web Animations API for Everyone
    5 projects | | 22 Sep 2021
    Here's the npm module:[email protected]/dist/

    Given that the repo is private, I wondered if only the compiled version would be available. Looks like it isn't, so this is a bit different from Mattermost, where the MIT license only applies to the compiled version:

    If there's one word I'd use to describe the licensing of both Mattermost and Motion One, it's "encumbered"

  • Introducing Capact, your new way to manage applications and infrastructure
    6 projects | | 21 Sep 2021
    Let's take Mattermost installation as an example. Mattermost is an open-source alternative for Slack.
  • Mattermost - Open-source Slack alternative.
    1 project | | 19 Sep 2021
  • Collaboration tools recommendations like Slack
    2 projects | | 12 Sep 2021
  • Is there any Slack self-hosted Alternative?
    7 projects | | 20 Aug 2021
    Have a look at


Basic Mattermost repo stats
4 days ago

mattermost/mattermost-server is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.

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