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Software · Self-hosting

Mattermost

An open source platform for developer collaboration.

  • Completely free
  • Windows, Linux and Android
  • Open source
  • No account

Overview

Features described in its F-Droid listing, in its GitHub repository and on its official website: self-hosting on your own server, API for automation and integration, screen sharing.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Zero-trust collaboration, automation and AI in private cloud, self-hosted, and air-gapped environments.” — official website, 10 November 2026
  • “Connect in-house systems with webhooks and Slack-compatible integrations” — F-Droid, 10 November 2026
  • “Mattermost is an open core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration.” — GitHub, 10 November 2026

At a glance

Mattermost is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (Apache-2.0) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Plans and conditions

  • The publisher also offers paid plans (hosting, support or services); they are described on its website.

Strengths

  • Open source code
  • No account needed
  • No advertising
  • Commercial use allowed

About

Mattermost is a secure collaboration platform that is open, flexible, and deeply integrated with the tools you love. An alternative to SaaS collaboration solutions, Mattermost is built explicitly for developer teams, tools, and workflows. It is written in Golang and React and runs as a production-ready Linux binary under an MIT license with either MySQL or Postgres.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Official plan pages (pricing, licence, terms) (limits, commercial use) —
  • Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Comptoir du Libre (source code, licence) —
  • Facts collected from F-Droid (credit card, source code, licence, free status, platforms, ads, commercial use, version) —
  • Facts collected from LicitPro automatic classification () —
  • Last technical check: 6 November 2026
  • Description from Flathub — AppStream (Flathub)

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