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Slack

A messaging app for teams who see through the Earth!

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Top 12 Open-Source Alternatives to Slack

Telegram Discord Signal Bitrix24 Element.io Rocket.Chat Zulip Wire Yammer Matrix.org

Product categories

CRM CRM Platforms Chat Cloud Storage Communication Group Chat & Notifications Group Messaging Instant Messaging Internet Calls Messaging Project Management Task Management

Summary

The top open-source alternatives to Slack are Telegram, Discord, and Signal. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.
  1. Telegram Landing Page
    Telegram Landing Page
    1

    Telegram

    Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
    Pricing:
    • Open Source

    #Communication #Messaging #Instant Messaging 129 social mentions

  2. Discord Landing Page
    Discord Landing Page
    2

    Discord

    Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Messaging 122 social mentions

  3. Signal Landing Page
    Signal Landing Page
    3

    Signal

    Fast, simple & secure messaging. Privacy that fits in your pocket.
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Messaging 180 social mentions

  4. Bitrix24 Landing Page
    Bitrix24 Landing Page
    4

    Bitrix24

    Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
    Pricing:
    • Freemium
    • Free Trial
    • $69.0 / Monthly (6 users / 50 GB / CRM+)

    #Project Management #Task Management #Communication

  5. Element.io Landing Page
    Element.io Landing Page
    5

    Element.io

    Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
    Pricing:
    • Open Source
    • Free

    #Group Chat & Notifications #Communication #Chat 1 social mentions

  6. Rocket.Chat Landing Page
    Rocket.Chat Landing Page
    6

    Rocket.Chat

    Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Chat 65 social mentions

  7. Zulip Landing Page
    Zulip Landing Page
    7

    Zulip

    Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Messaging 50 social mentions

  8. Wire Landing Page
    Wire Landing Page
    8

    Wire

    Private & Secure Messenger
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Messaging 14 social mentions

  9. Yammer Landing Page
    Yammer Landing Page
    9

    Yammer

    Yammer is a leading enterprise social network used by more than 200,000 companies worldwide, including 85% of the Fortune 500, to get work done smarter and faster. Sign Up Today.
    Pricing:
    • Open Source

    #Project Management #Task Management #Communication

  10. Matrix.org Landing Page
    Matrix.org Landing Page
    10

    Matrix.org

    Matrix is an open standard for decentralized persistent communication over IP.
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Instant Messaging 582 social mentions

  11. Tox Landing Page
    Tox Landing Page
    11

    Tox

    Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
    Pricing:
    • Open Source

    #Communication #Group Chat & Notifications #Instant Messaging 28 social mentions

  12. Redmine Landing Page
    Redmine Landing Page
    12

    Redmine

    Flexible project management web application
    Pricing:
    • Open Source

    #Project Management #Task Management #Work Management 7 social mentions

Suggest an alternative
If you think we've missed something, please suggest an alternative to Slack.
Please use the Feedback button if you think any of the listed products shouldn't be regarded as open-source.

Slack discussion

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  1. Dmitry avatar
    Dmitry
    · 21 days ago
    · Reply

    The best way to communicate within the team!

  2. User avatar
    Dream100-AI
    · 5 months ago
    · Reply

    Best community building tool

  3. User avatar
    Frank Di Latte
    · 12 months ago
    · Reply

    Slack is a popular communication and collaboration platform that has gained significant popularity in recent years. It offers a range of features that facilitate team communication, such as chat channels, direct messaging, file sharing, and integrations with various third-party applications.

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