The best open source alternative to Slack is Element. It's not free, so if you're looking for a free alternative, you could try Element or Zulip. If that doesn't suit you, our users have ranked more than 100 alternatives to Slack and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Slack are Matrix, Wire, Stoat Chat and Threema.
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.
Glowing Bear is a sleek, modern web frontend that securely connects to a running instance of WeeChat using its built-in relay protocol. It relies on WeeChat to do all the heavy lifting and then provides some nice features on top of that, like...
This simple Matrix client written in Python allows you to send and receive messages and files, verify other devices, and interact with your Matrix account or other Matrix users in many ways. You use it from the terminal (CLI) or integrate it into other simple Python programs.
Start your next video call with a single click. No download, plug-in or login required. Just get straight to talking, messaging and sharing your screen.
Valour is an open-source, privacy focused alternative to platforms like Discord or Slack, developed by a small team of volunteers. The app has been in development for over three years and is currently in it's alpha stages of testing.
Campfire is an installable, self-hosted group chat system. Easily invite people. Make rooms. @mentions, DMs, and mobile support. The basics done right. And since you get the code and host it yourself, you can customize it however you’d like for your own use.
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:
Common Ground is a browser-based, open-source social platform for communities, built as a robust alternative to Discord.
AtomJump.com is a well tuned hosted version of the free open-source AtomJump.org. It is free to chat publicly with your family, group or co-workers on your own group.
WorkLand is a metaverse for tech teams. Team members can gather in WorkLand, manage projects, track tasks and get work done. WorkLand also features a break room.
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