Self-Hosted Index

Alternatives

Slack

Team chat priced per seat, with history limits on free plans and everything on Salesforce's servers.

5 self-hosted replacements in this index, ranked by GitHub stars in the dataset.

Replacements

  • Discourse

    Advanced forum / community solution based on Ruby and JS.

    48,040 stars Active

    30 Oct 2026 _gh-attach-assets

  • Rocket.Chat

    Communications platform that puts data protection first.

    46,353 stars Active

    31 Oct 2026 9.0.0-rc.3

  • Mattermost

    Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab.

    39,486 stars Active

    30 Oct 2026 v11.7.15-rc1

  • Zulip

    Powerful group chat application.

    26,145 stars Active

    30 Oct 2026 13.0-rc1

  • Element

    Fully-featured Matrix client for Web, iOS & Android.

    13,635 stars Active

    30 Oct 2026 v1.12.33