Open Source Slack Alternatives
The best open source alternative to Slack is Mattermost. 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 Element, Zulip, Rocket.Chat and Matrix.org.
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Slack alternatives are mainly Instant Messengers but may also be Group Chat Apps or Video Calling Apps. Other popular filters includes Self-Hosted + Open Source. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Slack.- Group Chat App
- Freemium • Proprietary
34 Semaphor alternativesZero Knowledge, end-to-end encrypted collaboration tool for teams and businesses. Reviewable source code. Python wrapper for bots & integrations. Encryption white paper. Native offline mode. Faster file-sharing. Built for enterprise.
License model
- Freemium • Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
Semaphor Features
- End-to-End Encryption
- AES-256 Encryption
- Real time collaboration
- Multiple Servers
- Mobile friendly
- Blockchain
- Integrated File Sharing
Semaphor VS Slack
Is Semaphor a good alternative to Slack?
31 WorkLand alternativesWorkLand 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.
License model
- Free • Open Source
Application types
Platforms
- Online
- Self-Hosted
WorkLand Features
- Video Conferencing
- Remote Work
WorkLand VS Slack
Is WorkLand a good alternative to Slack?
44 ArrowChat alternativesArrowChat 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 . The chat integrates right into your existing website using your existing usernames...
ArrowChat Features
- WordPress Integration
- Embeddable
- Multiple languages
- Voice Chat
- BuddyPress Integration
ArrowChat VS Slack
Is ArrowChat a good alternative to Slack?
13 Braid Chat alternativesBraid is a new kind of group collaboration tool, designed for teams that hate interruptions and just want to get shit done.
Say goodbye to chatrooms, and say hello to Braid!.
Braid Chat VS Slack
Is Braid Chat a good alternative to Slack?
58 MongooseIM platform alternativesMongooseIM is aimed at large, complex enterprise level projects, where real-time communication is critical for business success. It provides high availability, ease of deployment, development and reliability in production.
License model
- Free • Open Source
Platforms
- Mac
- Linux
- Amazon Web Services
- Microsoft Azure
MongooseIM platform Features
- VoiP Calls
- Voice Chat
- Chat history
- Xmpp
MongooseIM platform VS Slack
Is MongooseIM platform a good alternative to Slack?
14 Strafe Chat alternativesStrafeChat is a web application focused on no censorship. We believe that people with any belief, opinion, or view should be able to communicate with each other freely.
License model
- Free • Open Source
Application types
Platforms
- Online
- Self-Hosted
Top Strafe Chat Features
- Ad-free
- Privacy focused
- No Tracking
- Lightweight
- Dark Mode
- Two-factor Authentication
- End-to-End Encryption
- Support for @mentions
- Support for MarkDown
- Support for Themes
- VoiP Calls
Strafe Chat VS Slack
Is Strafe Chat a good alternative to Slack?
80 AtomJump.com alternativesAtomJump.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.
+3
License model
- Free • Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- iPad
AtomJump.com Features
- Extensible by Plugins/Extensions
- Portable
- Works Offline
- Screen Sharing
- Push to talk
AtomJump.com VS Slack
Is AtomJump.com a good alternative to Slack?
