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Top 10 Communication
open source projects

These are the 10 most popular open source Communication projects on GitHub right now, ranked by stars. Each entry is license-monitored — you'll know first if any of them relicense to BSL/SSPL or get archived.

Combined: 271,327 stars · refreshed nightly

// COMMUNICATION№ 001
Rocket.Chat

Rocket.Chat

TYPESCRIPT

The communications platform that puts data protection first

★ STARS

45.3k

⑂ FORKS

9.9k

OPEN PROJECT→
// COMMUNICATION№ 002
Novu

Novu

★ FEATUREDTYPESCRIPT

The open source Inbox component and notification platform

★ STARS

39.0k

⑂ FORKS

4.3k

OPEN PROJECT→
// COMMUNICATION№ 003
Mattermost

Mattermost

TYPESCRIPT

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle

★ STARS

36.6k

⑂ FORKS

8.6k

OPEN PROJECT→
// COMMUNICATION№ 004
Jitsi Meet

Jitsi Meet

TYPESCRIPT

Jitsi Meet - Secure, Simple and Scalable Video Conferences

★ STARS

29.2k

⑂ FORKS

7.9k

OPEN PROJECT→
// COMMUNICATION№ 005
Chatwoot

Chatwoot

RUBY

Open-source live-chat, email support, omni-channel desk. An alternative to Intercom, Zendesk, Salesforce Service Cloud

★ STARS

29.1k

⑂ FORKS

7.2k

OPEN PROJECT→
// COMMUNICATION№ 006
Zulip

Zulip

PYTHON

Zulip server and web application. Open-source team chat

★ STARS

25.2k

⑂ FORKS

9.8k

OPEN PROJECT→
// COMMUNICATION№ 007
Listmonk

Listmonk

GO

Open-source platform for managing subscribers, creating campaigns, and sending bulk emails with advanced features and integrations.

★ STARS

20.0k

⑂ FORKS

2.0k

OPEN PROJECT→
// COMMUNICATION№ 008
Postal

Postal

RUBY

Self-hosted email delivery platform with powerful features for transactional and bulk emails, offering full control and customization.

★ STARS

16.5k

⑂ FORKS

1.2k

OPEN PROJECT→
// COMMUNICATION№ 009
Flarum

Flarum

PHP

Lightweight, extensible forum platform with a sleek interface, powerful moderation tools, and seamless integration capabilities.

★ STARS

16.3k

⑂ FORKS

1.7k

OPEN PROJECT→
// COMMUNICATION№ 010
Lemmy

Lemmy

RUST

Open-source forum and link aggregator that connects communities across the fediverse. Self-hosted, ad-free, with powerful moderation tools and federation.

★ STARS

14.4k

⑂ FORKS

948

OPEN PROJECT→

// FREQUENTLY ASKED

What is the best open source Communication project?

Rocket.Chat is the most popular with 45,269 GitHub stars. The communications platform that puts data protection first

What are the top 10 open source Communication projects?

1. Rocket.Chat · 2. Novu · 3. Mattermost · 4. Jitsi Meet · 5. Chatwoot · 6. Zulip · 7. Listmonk · 8. Postal · 9. Flarum · 10. Lemmy

How are these ranked?

Pure GitHub star count, refreshed nightly. We don't accept payments to rank projects higher.