Mattermost

mattermost is an open source, self-hosted slack alternative.

Free
Open Source
Mac OS X
Windows
Linux
Android
iPhone
Android Tablet
iPad
Self-Hosted

mattermost is an open source, selfhosted slack alternative.

as an alternative to proprietary saas messaging, mattermost brings all your team communication into one place, making it searchable and accessible anywhere. it’s written in golang and react and runs as a productionready linux binary under an mit license with either mysql or postgres.

mattermost is:

slackcompatible, not slacklimited – mattermost features rival slack features, and support a superset of slack’s incoming and outgoing webhook integrations, including compatibility with existing slack integrations. from your existing slack teams, you can import users, public channel history and even theme setting colors into mattermost.

mobile and desktop apps, in addition to web – use mattermost from your ios or android phones and tablets or with installed apps on windows, linux and mac.

easy to deploy, manage, and upgrade – mattermost runs as linux binary, docker image, and many other forms. try mattermost with a oneline docker install, and many install guides are available. improvements ship monthly.

supported by a vibrant community – use mattermost with dozens of community integrations and applications, including jira, irc, xmpp, hubot, giphy, jenkins, gitlab, trac, redmine, svn, rss/atom and many others. build and share your own apps using mattermost apis and drivers.

Links to official Mattermost sites

Official Website
GitHub
Facebook

Features

MarkDown support Group chat Slack integration Team Collaboration Integrated File Sharing Data API On premises software Plugin API

The Best 4 Mattermost Alternatives

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Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful. .

Free Mac OS X Windows Linux Android iPhone Web Blackberry Mac Windows Mobile

Portable Privacy protection Ad free Built in File transfer IFTTT integration Works Offline Share files Video calling Voice Call Cloud sync Multiple Account support Lightweight Group chat Multi Device Support Voice messages Search by tags Support for Themes Chat Bot Encrypted chat Photo Sharing Public groups chat Push to talk Anonymous Secure Filesharing End to end encryption Self destructing messages Share Videos Based on phone number Stickers Send Big files Portable Linux In Game Overlay Built in Photo editor Encrypted calls Encrypted VoIP calls GPS Location Tracking Messages in cloud Persistent History Secret chats
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Rocket.Chat

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.

Free Open Source Windows Linux Android iPhone Mac Self-Hosted Cloudron

Extensible by Plugins/Extensions Ad free Share your screen Group chat Voice messages Chat Bot Integrated File Sharing Location Mapping
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AstraChat

AstraChat is a standalone and lightweight Jabber (XMPP) client application for mobile and desktop that connects directly to your XMPP server without any proxies...

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Security focused Ad free Voice Call Real time collaboration Voice messages
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Telegram X

Built in Swift, with higher speed, slicker animations, themes and more efficient battery use.

Free Android iPhone Android Tablet iPad

Ad free Built in File transfer Voice Call Cloud sync Support for Themes Chat Bot Stickers

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Mattermost

Links to official Mattermost sites

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The Best 4 Mattermost Alternatives

Telegram

Rocket.Chat

AstraChat

Telegram X

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