Best Self-hosted Team Chat & Messaging Tools in 2026

Rocket.Chat

Secure, flexible team communication platform

Stars
45,221
Forks
13,541
Last commit
9 hours ago

Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.

Open Source Alternative to:

Discord

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,481
Forks
8,576
Last commit
9 hours ago

Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Open Source Alternative to:

Microsoft Teams

Zulip

Organized team chat for distributed teams

Stars
25,119
Forks
9,806
Last commit
1 day ago

Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.

Open Source Alternative to:

Microsoft Teams

Element

Secure, decentralized messaging for teams and individuals

Stars
13,055
Forks
2,586
Last commit
11 hours ago

Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Discord

Fluxer

Open source messaging with privacy and community focus

Stars
8,462
Forks
484
Last commit
21 days ago

Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

Campfire

Self-hosted group chat without recurring subscription fees

Stars
4,294
Forks
719
Last commit
18 days ago

Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Microsoft Teams

UnInbox

Transform team email into efficient collaborative workflows

Stars
1,722
Forks
126
Last commit
3 months ago

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Microsoft Teams

Twake Chat

Secure open source messaging for professional teams

Stars
153
Forks
42
Last commit
14 hours ago

Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.

Open Source Alternative to:

Microsoft Teams

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Rocket.Chat

Secure, flexible team communication platform

Stars
45,221
Forks
13,541
Last commit
9 hours ago

Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.

Open Source Alternative to:

Discord

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,481
Forks
8,576
Last commit
9 hours ago

Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Open Source Alternative to:

Microsoft Teams

Zulip

Organized team chat for distributed teams

Stars
25,119
Forks
9,806
Last commit
1 day ago

Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.

Open Source Alternative to:

Microsoft Teams

Element

Secure, decentralized messaging for teams and individuals

Stars
13,055
Forks
2,586
Last commit
11 hours ago

Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Discord

Fluxer

Open source messaging with privacy and community focus

Stars
8,462
Forks
484
Last commit
21 days ago

Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

Campfire

Self-hosted group chat without recurring subscription fees

Stars
4,294
Forks
719
Last commit
18 days ago

Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Microsoft Teams

UnInbox

Transform team email into efficient collaborative workflows

Stars
1,722
Forks
126
Last commit
3 months ago

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Microsoft Teams

Twake Chat

Secure open source messaging for professional teams

Stars
153
Forks
42
Last commit
14 hours ago

Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.

Open Source Alternative to:

Microsoft Teams

Self-hosted Team Chat & Messaging Tools

A curated collection of the best self-hosted platforms for real-time team messaging and chat.