Top 12 Open-Source Alternatives to Mattermost

Mattermost

Mattermost is an open source alternative to Slack.

As Mattermost is an open source project, you can find more open source alternatives and stats on LibHunt.

61 mentions

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Pricing:

Open Source
Official Pricing

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Product categories

Audio Conferencing Chat Chat SDK Communication Group Chat & Notifications Group Messaging Instant Messaging Internet Calls Live Chat Messaging Project Management Work Collaboration

Summary

The top open-source alternatives to Mattermost are Telegram, Element.io, and Zulip. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Telegram Landing Page
1

Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Pricing:
- Open Source
#Communication #Messaging #Instant Messaging 129 social mentions
Element.io Landing Page
2

Element.io

Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Pricing:
- Open Source
- Free
#Group Chat & Notifications #Communication #Chat 1 social mentions
Zulip Landing Page
3

Zulip

Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
Pricing:
- Open Source
#Communication #Group Chat & Notifications #Messaging 54 social mentions
Matrix.org Landing Page
4

Matrix.org

Matrix is an open standard for decentralized persistent communication over IP.
Pricing:
- Open Source
#Communication #Group Chat & Notifications #Messaging 583 social mentions
Tox Landing Page
5

Tox

Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Pricing:
- Open Source
#Communication #Group Chat & Notifications #Instant Messaging 29 social mentions
MirrorFly Landing Page
6

MirrorFly

World's Most Scalable Voice, Video & Chat SDK for Small, Medium & Enterprises
Pricing:
- Open Source
- Paid
- Free Trial
#Communication #Chat SDK #Group Chat & Notifications 8 user reviews
Notion Landing Page
7

Notion

All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Pricing:
- Open Source
#Productivity #Work Collaboration #Note Taking 438 social mentions
Cinny Landing Page
8

Cinny

A Matrix client where you can enjoy the conversation using simple, elegant and secure interface protected by e2ee with the power of open source.
Pricing:
- Open Source
#Communication #Group Chat & Notifications #Instant Messaging 9 social mentions
Flow Landing Page
9

Flow

Stop managing projects from your inbox.
Pricing:
- Open Source
#Project Management #Task Management #Work Collaboration 1 social mentions
Revolt.chat Landing Page
10

Revolt.chat

Don't bother with chat apps that don't respect your privacy. Revolt is a brand new chat platform designed around you.
Pricing:
- Open Source
#Communication #Live Chat #Group Chat & Notifications 88 social mentions
nheko Landing Page
11

nheko

Social & Communications
Pricing:
- Open Source
#Communication #Group Chat & Notifications #Instant Messaging 2 social mentions
ChatSecure Landing Page
12

ChatSecure

ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Pricing:
- Open Source
#Communication #Group Chat & Notifications #Instant Messaging 2 social mentions