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.

Slack

851

Group Chat App
Freemium • Proprietary

Facilitates teams' real-time collaboration with versatile chat interface and advanced search in configurable channels across multiple platforms.

More about Slack

Slack alternatives page was last updated Sep 18, 2024

Total.js Messenger
Total.js Messenger is a small alternative to Slack built on Node.js and total.js .
22 Total.js Messenger alternatives
License model
- Freemium • Open Source
Application types
- Team Collaboration Tool
- Instant Messenger
Platforms
- Self-Hosted
- Node.JS
Total.js Messenger VS Slack
Is Total.js Messenger a good alternative to Slack?

Videolify
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.
128 Videolify alternatives
License model
- Free • Open Source
Application type
- Video Calling App
Platforms
- Online
- Microsoft Edge
- Internet Explorer
- Google Chrome
- Opera
- Brave
- Firefox
Videolify Features
WebRTC
Video Conferencing
Peer-To-Peer
Show all NaN Videolify features ▾
Videolify VS Slack
Is Videolify a good alternative to Slack?

PrivMX Fusion
PrivMX Fusion is safe and easy collaboration software for all kinds of teams, with virtual workspace protected by end-to-end encryption. Each team uses desktop/laptop client software and its own (zero-knowledge) PrivMX Team Server.
104 PrivMX Fusion alternatives
License model
- Freemium • Open Source
Application types
- Group Chat App
- Team Collaboration Tool
Platforms
- Mac
- Windows
- Linux
- Self-Hosted
- Software as a Service (SaaS)
+9
Top PrivMX Fusion Features
1. No Tracking
2. End-to-End Encryption
3. Kanban Board
4. AES-256 Encryption
5. VoiP Calls
6. Decentralized
7. Block Trackers
8. Two-factor Authentication
9. Team work
10. Task Scheduling
11. Task Tracking
12. Share screenshots
Show all NaN PrivMX Fusion features ▾
PrivMX Fusion VS Slack
Is PrivMX Fusion a good alternative to Slack?

Fugu Simple Work Chat
Simple yet powerful open source slack alternative chat platform for teams and organizational communication. Keep your conversations in your control, free from data mining and ads. Safe from prying eyes and secured with encryption.
97 Fugu Simple Work Chat alternatives
License model
- Free • Open Source
Application types
- Group Chat App
- Team Collaboration Tool
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
Fugu Simple Work Chat Features
1. Privacy focused
2. Secure Chat
3. Attendance management
4. Omnichannel messaging
5. Microsoft Teams Integration
6. Team Messaging
Show all NaN Fugu Simple Work Chat features ▾
Fugu Simple Work Chat VS Slack
Is this a good alternative to Slack?

ScudCloud
ScudCloud is a non official open-source Ubuntu desktop client for Slack.
15 ScudCloud alternatives
License model
- Free • Open Source
Application type
- Instant Messenger
Platforms
- Linux
- Linux Mint
- Kubuntu
- Ubuntu
ScudCloud Features
Slack client
Show all NaN ScudCloud features ▾
Discontinued
The project's repository has been archived. https://github.com/raelgc/scudcloud

ScudCloud VS Slack
Is ScudCloud a good alternative to Slack?

Glowing Bear
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...
45 Glowing Bear alternatives
License model
- Free • Open Source
Application type
- IRC Client
Platforms
- Online
- Self-Hosted
- Google Chrome
- WeeChat
Glowing Bear Features
Web-Based
IRC
Show all NaN Glowing Bear features ▾
Glowing Bear VS Slack
Is Glowing Bear a good alternative to Slack?

Wey
Fast open source Slack desktop app, written in Node.js with native UI powered by the Yue library.
118 Wey alternatives
License model
- Free • Open Source
Platforms
- Mac
- Windows
- Linux
Wey Features
Slack client
Show all NaN Wey features ▾
Discontinued
This repository has been archived by the owner on Apr 12, 2023. It is now read-only.last commit on May 21, 2022Note that this project is not actively maintained, you may want to use the fork lounge-lizard instead.Do not use this for work, you might miss important messages due to bugs and missing features.

Wey VS Slack
Is Wey a good alternative to Slack?