Open Source Self-Hosted Slack Alternatives

    Slack is not available as a self-hosted solution but there are plenty of alternatives for power users and business that want to host a solution on-premise. The best Self-Hosted alternative 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 available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting Self-Hosted 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).

    This page was last updated Jul 24, 2021

    1. Self-hosted chat for small teams.

      Discontinued

      As stated at https://github.com/sdelements/lets-chat/issues/781 , the project is no longer developed since August 2017. Last version, 0.4.0, released in June 2015, can be still downloaded from GitHub together with the source code.

      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Online
      • Self-Hosted
      • Python
      • JavaScript
      • ZeroNet
      An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet stack. In addition, making a new chatroom website is a simple as downloading the files and cloning the site.

      Discontinued

      Last update on github made over 5 years (March 13, 2016).



    2. eXo Platform is an all-in-one digital workplace solution that helps you connect, align and engage your teams around a single interface. You can use it to improve company and peer-to-peer communication, boost collaboration and manage company knowledge.
      No screenshots yet
      • FreeOpen Source
      • Online
      • Android
      • Self-Hosted
      hack.chat is a minimal, distraction-free chat application.
      Channels are created and joined by going to https://hack.chat/?your-channel. There are no channel lists, so a secret channel name can be used for private discussions.

      Source code : https://github.com/hack-chat/main
      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Online
      • Android
      • iPhone
      • Chrome OS
      • Self-Hosted
      Dirc is a peer-to-peer web application which uses WebRTC to set up connections between chat participants without requiring a back-end server. The static files can be self-hosted. Other features: * Identities are key pairs (NaCl).


      • FreemiumOpen Source
      • Self-Hosted
      • total.js
      • Node.JS
      Total.js Messenger is a small alternative to Slack built on Node.js and total.js .
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      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Self-Hosted
      No servers are needed to join a cabal, or to start your own. Everything is stored and runs locally. A cabal can never go down or be taken away.
      No screenshots yet
      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Online
      • Android
      • Android Tablet
      • Self-Hosted
      • Google Chrome
      • WeeChat
      • Firefox OS
      • Google Play Store
      • Firefox
      Glowing Bear is a sleek, modern web frontend that securely connects to a running instance of WeeChat using its built-in relay protocol.
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    3. Powered by WebRTC, Real-time video call, chat room and screen sharing entirely browser based.
      No screenshots yet
    4. ArrowChat is a self-hosted live chat software based on PHP script and jQuery. It is placed at the bottom of your website similar to Facebook Messenger .
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    Showing 20 of 25 alternatives