Open Source Slack Alternatives

    The best open source alternative to Slack is Mattermost, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Slack and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Slack are Element (Free Personal, Open Source), Zulip (Free Personal, Open Source), Rocket.Chat (Freemium, Open Source) and Matrix.org (Free, Open Source).

    The list of alternatives was last updated Jun 11, 2021

    Platforms

    • Online
    • Android
    • iPhone
    • Windows
    • Mac
    • iPad
    • Linux
    • Android Tablet
    • Software as a Service (SaaS)
    • Self-Hosted
    • Chrome OS
    • Windows Phone
    • Apple Watch
    • Google Chrome
    • BSD
    • Blackberry
    • Cloudron
    • Slack
    • Windows S
    • JavaScript

    Features

    • Team Collaboration
    • Group chat
    • Real time collaboration
    • Chat
    • Video chat
    • Task Management
    • Project management
    • File sharing
    • Integrated File Sharing
    • Messaging
    • Team chat
    • Video calling
    • Group collaboration
    • Encrypted chat
    • Voice Call
    • Team messaging
    • Team work
    • Share your screen
    • Video Conferencing
    • Voice chat

    License

    × Clear
    • Free
    • Open Source
    • Paid
    All Filters

    Showing 40 of 42 alternatives