Open Source Slack Alternatives
Discover 4 open source alternatives to Slack. All free, community-driven, and actively maintained.
What is Slack?
Rocket.Chat
The Secure CommsOS™ for mission-critical operations
Chat
mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
Collaboration
zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Chat
element-web
A glossy Matrix collaboration client for the web.
Matrix